A. because exothermic means releasing energy so the product would have less energy
In an exothermic process like 2H2+O2→2H2O, the bond energy in the reactants is greater than the bond energy in the products.
Explanation:The process 2H2+O2→2H2O is an exothermic reaction, meaning energy is released during the course of the reaction. In an exothermic reaction, the total bond energy of the reactants is more than the total bond energy of the products. The difference in energies is released as heat. Therefore, the correct answer to the question is: A. Bond energy in the reactants is greater than bond energy in the products.
To be more specific, when the bonds in the reactants (hydrogen and oxygen) break down, energy is required. However, when new bonds form to create water, energy is released. If the energy released is more than the energy absorbed, the reaction is exothermic.
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Most animal cell membranes have proteins that pump ______ ions out of the cell and potassium ions into the cell. A) calcium B) carbon C) magnesium D) sodium
In which location would soils develop faster? Explain.
Scientists who contributed to our current body of knowledge
1. Which of the following doesn't describe an MDC?
A. It's highly industrialized.
B. It has undergone the demographic transition.
C. It generally experiences replacement reproduction.
D. Its age structure diagram resembles a pyramid.
A newly discovered solar system is found 600 billion kilometers from the sun. How many AU does this represent? Show your work.
Answer:
[tex]4011[/tex] AU
Explanation:
AU stands for astronomical unit. It is a unit of measurement in space.
One AU is equal to [tex]1.496 * 10^8[/tex] Kilometers.
Given -
The distance between the newly discovered solar system and the sun [tex]= 600[/tex] 600 billion kilometers.
[tex]= 600* 10^9\\= 6 ^ 10^ {11}[/tex] kilometers
Converting this distance (in kilometer) to AU , we get -
[tex]\frac{6*10^{11}}{1.496*10^8} \\= 4.011 * 10^3\\= 4011[/tex]AU
Where do daughter cells obtain their DNA?
a. from the duplicated chromosomes in the nucleus of the parent cell
b. from the splitting of the cytoplasm in cytokinesis
c. from all of the original parent chromosomes during cell division
d. from inheriting 10% of the parent cell's genetic material
B. From the duplicated chromosomes in the nucleus of the parent cell .
because, the nucleus is the repository for genetic information.
how could you tell that a cell is a plant cell and not an animal cell
Plant cells can be identified by their rigid cell wall, chloroplasts, a large central vacuole, and plastids, unlike animal cells that lack these structures but have organelles such as centrioles and lysosomes.
Explanation:When distinguishing between plant cells and animal cells, several key cellular structures can be observed. Plant cells have a rigid cell wall made of cellulose that surrounds the plasma membrane, which helps in maintaining a distinct shape and providing structural support that enables plants to grow upright. In contrast, animal cells lack this cell wall.
One of the most definitive features of plant cells is the presence of chloroplasts, which are the sites of photosynthesis, a process unique to plants and some protists that converts solar energy into chemical energy. Animal cells do not have chloroplasts. Additionally, plant cells often contain a single large central vacuole that holds materials and wastes, and helps to maintain proper pressure within the plant cells to provide structure and support. Animal cells may have small vacuoles, but not a large central one as seen in plant cells.
Another difference is that plant cells have plasmodesmata, which are channels between the cell walls of adjacent plant cells, facilitating communication and transport between them. They also possess various kinds of plastids like chloroplasts, leucoplasts, and chromoplasts that are involved in processes such as photosynthesis, storage, and imparting color. However, animal cells contain other organelles like centrioles and lysosomes that are absent in plant cells.
if a person has a mass of 60 kilograms,what is his mass in tons
In general, which trophic level has the LEAST energy available to it? A) producer B) primary consumer C) secondary consumer D) tertiary consumer
The trophic level which has the least energy available to it is the tertiary consumer. Therefore, option D is correct.
What is the flow of energy in an ecosystem?The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
In an ecosystem, energy always moves in a single direction. It is referred regarded as unidirectional because, in order to maintain an organism's homeostasis, some energy is wasted as heat when going from one trophic level to the next.
Thus, the trophic level which has the least energy available to it is the tertiary consumer. Therefore, option D is correct.
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in the diagram which layer is the oldest? J,D,Z, or F?
Answer:
f
Explanation:
What happens to the endometrium if a zygote implants?
Please help me with my biology hw-
1.) The basic unit from which cell membranes are constructed is
a- cell walls
b-free moving proteins
c- phospholipid layer
2.) Four glucose molecules are found in a cell and ten are found outside the cell. At equilibrium, how many glucose molecules would be found in a cell, assuming the glucose molecules can cross the cell membrane?
a- 4
b- 7
c- 10
3.) The movement of water in or out of a cell is called:
a- diffusion
b- osmosis
c- facilitated diffusion
4.) If a red blood cell is placed in pure, fresh water, the cell will:
a- stay the same
b- burst
c- become darker
5.) Which of the following would occur if a cell with 1% dissolved salt solutes is placed in a 10% salt solution?
a- the cell would swell
b- water would leave the cell
c- the cell would burst
The basic unit from which cell membranes of the cell are constructed are phospholipid layers. Phospholipid bilayer is found to be present in the cell. Thus, the correct options for 1, 2, 3, 4, and 5 are C, B, B, B, and B, respectively.
What is Cell membrane?The cell membrane is also known as the plasma membrane. It is found in all the different types of cells and it is responsible for separating the interior of the cell from the outside environment in which the cells are present. The cell membrane consists of a phospholipid bilayer which is semipermeable in nature. The cell membrane regulates transport of materials from entering and exiting the cell.
Equilibrium is a state which marks the balance of substances inside and out of the cell. In this condition, there are total 14 molecules of glucose (4 inside + 10 outside) therefore, to achieve a balanced state there must be 7 molecules of glucose inside as well as outside the cell.
The movement of water inside or outside of a cell is called Osmosis.
If a red blood cell is placed in a pure, fresh water, the cell will burst. This is due to osmosis as the concentration of water is less inside the cell as compared to outside environment. Water moves inside the cell which leads to bursting of the cell.
If a cell with 1% dissolved salt solutes is placed in a 10% salt solution then the water would leave the cell because of the concentration gradient of the water.
Therefore, the correct options for 1, 2, 3, 4, and 5 are C, B, B, B, and B, respectively.
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What procedures must be described in an agreement called an "assurance of compliance" with ohrp? procedures in place to ensure that the research complies with ethical principles (such as the world medical association’s declaration of helsinki). procedures in place that ensure that subjects will be protected in a manner commensurate with the common rule, including review by an independent committee comparable to an irb. procedures in place to outline how unanticipated problems will be reported to the local irb. procedures in place to outline how subjects will be randomized?
Answer;
-Procedures in place that ensure that subjects will be protected in a manner commensurate with the Common Rule, including review by an independent committee comparable to an IRB.
Explanation;
-HHS human subject protection regulations and policies necessitate that any institution that is involved in non-exempt human subjects research conducted or supported by HHS must submit a written assurance of compliance to OHRP.
- The Federalwide Assurance (FWA) is the only type of assurance of compliance accepted and approved by OHRP.
Typhoid fever is caused by bacteria in contaminated food or drink. In 1903, an outbreak of typhoid fever in Ithaca, New York, killed almost 80 people. In addition, more than 1,000 Ithaca residents became sick with the disease. The population shares the public water source. Which type of limiting factor was involved in the typhoid outbreak that occurred in Ithaca?
Answer:
The correct answer is- density dependent factor.
Explanation:
Density dependent limiting factor is only relevant where carrying capacity exceeded in a particular habitat . Density dependent factor is a factor that limiting the population size whose effect depend on the number of individuals or people in a population.
Densely packed populations can easily read the disease such as typhoid due to close proximity to one another of the individuals of the population.
Thus, the correct answer is - density dependent factor.
Some students are performing a hydrobiology project on a creek. They obtained the GPP value as 7 mg/l and the R value as 3 mg/l. What could be the NPP for the creek water?
The answer is C, with 4mg/l. Because 7-3, equals four and secondly, just took the test and the answer was four.
sean notices two boys shoving another student in the hallway .the next day, he seen them doing the same thing
The student's question describes scenarios related to bullying and conflict resolution in a school setting, which falls under Social Studies for Middle School. The answer details the importance of understanding bullying dynamics, fostering empathy, and empowering students to be proactive in addressing such incidents.
The scenarios described involve observations of social interactions and dynamics that are indicative of bullying behavior and conflict resolution. These observations and experiences draw on understanding emotional cues, social hierarchies, and the consequences of certain behaviors in a school environment. Addressing these situations requires a blend of social awareness and the application of health and social skills. It is important that students learn about the impact of bullying, how to seek help, and strategies to handle conflicts in a constructive manner, fostering a safe and supportive school climate.
Bullying is a serious issue that can lead to long-term psychological effects, which is why there are numerous resources and strategies available to students, teachers, and parents to address such incidents. The content also highlights an important aspect of student life - the need for empathy and understanding. When we encounter individuals who are often labeled as bullies, it's essential to recognize that their behavior might stem from deeper issues, and displaying empathy could be the first step in resolving conflicts and promoting a more positive school culture.
It is equally important to teach students about the responsibilities of bystanders and empower them to act against bullying. Creating an educational dialogue around these topics supports the development of a comprehensive approach to bullying and conflict resolution in schools.
What energy transformation occurs when a battery-powered toy car is set into motion when it is switched on?
chemical to mechanical to electrical
electrical to mechanical to chemical
electrical to chemical to mechanical
chemical to electrical to mechanical
chemical because batterys then eletrical becuase you turn on the car then mechanical
Which soil would you espect to be better developed: the soil on a hillside or the soil on a valley floor? Why?
the deforestation of rainforest ecosystems for logging and for farming has had what direct effect on those areas
A.desertification of the areas
B.a decrease in the average annual tempature
C.the increase of high fertile topsoil
D.prouduction of a sustainable area of fertile land
Answer: A. desertification of the areas.
Explanation:
Deforestation is a process of removal of the forests bearing trees. This directly affect the climate of that region. This may be responsible for reducing the amount of annual precipitation as trees liberate water in the atmosphere through transpiration.
According to the given situation the deforestation of rainwater ecosystem for the purpose of logging and farming will lead to desertification of the areas.
As in absence of rain the soil will loose it's fertility. The atmosphere will become dry and hot as in deserts.
Some of the waves energy stays in the_______
Fill in the blank
Some of the wave's energy stays in the medium itself. This is because the energy of a wave depends on its amplitude and frequency of it.
Where does the energy of a wave go?The amount of heat that is constructed or produced by the breaking wave is so imperceptibly small that I never could have imagined that that was what was happening, but it does make perfect sense. The energy goes from wind to water to sound and heat.
The components of the energy are Kinetic and Potential. The total mechanical energy of the wave is the sum of its kinetic energy and potential energy. The energy of the wave correspondingly absorbed via the medium in which is significant travels a specific distance.
Therefore, some of the wave's energy stays in the medium itself. This is because the energy of a wave depends on its amplitude and frequency of it.
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Marine iguanas feed primarily on (2 points)
dead bugs
small mammals
algae
leaves of land plants
Marine iguanas primarily feed on algae, and they have developed special adaptations for eating algae. They are often found in areas with abundant algae growth.
Explanation:Marine iguanas feed primarily on algae, which is a type of plant that grows in water.
They have adapted to their environment by developing special adaptations that allow them to eat algae, such as long, sharp teeth for scraping algae off rocks and a flat snout for efficiently eating algae.
They are often found in areas with abundant algae growth, such as rocky shores and coral reefs.
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The equation for photosynthesis is 6CO2 + 6H2O + Light → C6H12O6 + 6O2. Which process could provide the CO2 necessary for this photosynthesis?
Cellular respiration provide the CO2 necessary for this photosynthesis
What is Cellular Respiration?Like photosynthesis, cellular respiration is a major metabolic process in which a series of steps occur to convert chemical energy (sugar) into ATP in the cell.
Cellular respiration occur in the cytoplasm and mitochondria of the cell of the body, the major events like Glycolysis occurs inside the cytoplasm, where as TCA cycle occurs inside the matrix of the mitochondria.
Oxidative phosphorylation takes place in the inner mitochondrial membrane, The first stage glycolysis where glucose molecule breaks into two smaller molecules called pyruvate, and releases small amount ATP and it is oxygen independent.
In second stage where pyruvate molecules are reorganized and fused over again in a cycle, carbon dioxide is formed and electrons are removed.
These electrons placed in an electron transport system release ATP which can be used for the plant to use for growth and reproduction and this process is oxygen dependent.
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What is not necessary for an organism to survive A energy B parents C water
Why might scientists who study changes of state build models showing the arrangement of particles in a substance?
Water molecules form hydrogen bonds to help in the process of water transport. Which property of water is described?
explain how eutrophication can change an aquatic ecosystem into a land ecosystem
Answer:
Eutrophication is a natural phenomena which occurs because of the surface runoff of minerals and sediments inside the water body where the water flow remains static for example lakes and ponds. The settled deposits aids in the growth and abundance of aquatic plants which depletes the oxygen level in the water. The increase in the abundance of plants typically wild weeds acquire the entire space occupied by the water body and this leads to the transformation of the aquatic ecosystem into terrestrial or land ecosystem.
Which of earth's systems was most affected by fossilized dinosaurs?
A. Biosphere
B. Hydrosphere
C. Lithosphere
D. Atmosphere
The system most affected by fossilized dinosaurs is C. Lithosphere.
Fossilized dinosaurs primarily impact the lithosphere, which is the Earth's outer layer consisting of the crust and upper mantle. Fossils, including those of dinosaurs, are embedded in sedimentary rock formations within the lithosphere. These fossils provide crucial information about the Earth's past environments, climate, and biological evolution. Over geological time, the remains of dinosaurs became part of sedimentary rock layers, contributing to the geological record.
The study of these fossils helps scientists understand historical changes in the Earth's lithosphere, including shifts in tectonic activity and sediment deposition patterns. While dinosaurs also had an impact on the biosphere during their existence and their fossils may inform us about past atmospheric conditions and hydrosphere changes, their primary influence on current scientific understanding is through their presence in the lithosphere.
50 POINTS PLZ HELP !!!!!!!
Human activities, like burning fossil fuels and deforestation, have greatly contributed to global warming. In this discussion assessment, you will go on a trip around the world to explore the effects of climate change.
Choose one destination that is represented by a flag. Write a paragraph about the effects of climate change in that destination. Post your paragraph on the Climate Change.
Will give brainlest please write a paragraph so five sentences
PLZZZ HELP! The protist seen here is called euglena. It is both animal-like and plant-like. It eats food but it also has chloroplasts like a plant cell, in order to make food. The euglena has one structure that helps it move. It is visible here. What is that cellular structure?
A) cilia
B) flagellum
C) ribosomes
D) Golgi Bodies
Answer:
Option B, flagellum
Explanation:
Flagellum is a locomotory organ in Euglena that allows it to move through the water. A flagellum is located on the front or anterior side of body of euglena. It looks like a thread like structure which is capable to act like a motor.
Euglena can whip it flagella just like a helicopter propeller and thus it comes under the species category of "species with falgellatory locomotion"
Hence, option B is correct
Carbohydrate molecules have all of the following bonds except-
A.C-C
B.C-N
C.C-H
D.C-O
Answer:
B. C-N
Explanation:
Carbohydrates are bio-molecules which are basically made up of three elements named as carbon (C), hydrogen (H) and oxygen (O) so they will have bonds like C-C, C-H & C-O but will not have C-N bond.
Carbohydrates mainly serve the function of providing energy to the body. The energy lies in the the chemical bonds of carbohydrate molecules which is released when the these bio-molecules are oxidized in the presence of air.
Carbohydrates can exist as monosaccharides, disaccharides or polysaccharides.
Monosaccharides like glucose and fructose are the simplest and instant source of energy.
Disaccharides are sucrose, maltose, and lactose.
Polysaccharides like glycogen (in animals) and starch (in plants) are used for the storage of carbohydrates so that they could be used for energy in future.
Carbohydrate molecules have all of the following bonds except C-N. Therefore, the correct answer is option b.
Carbohydrates are organic compounds made up of carbon (C), hydrogen (H), and oxygen (O) atoms. These atoms are arranged in a specific way to form the carbohydrate molecules. The primary types of chemical bonds found in carbohydrate molecules are carbon-carbon (C-C) bonds and carbon-oxygen (C-O) bonds.
Here's an explanation of the bonds mentioned:
C-C Bonds (Carbon-Carbon Bonds): These are covalent bonds between two carbon atoms. In carbohydrate molecules, such as glucose or sucrose, you will find multiple C-C bonds as carbon atoms are linked together to create the carbon backbone of the molecule. These bonds are essential for the structure of carbohydrates.
C-O Bonds (Carbon-Oxygen Bonds): These are also covalent bonds but exist between carbon and oxygen atoms. C-O bonds are crucial in carbohydrates because they connect carbon atoms to oxygen atoms in the carbohydrate's functional groups, such as hydroxyl (-OH) groups. These bonds are important for the chemical properties and reactivity of carbohydrates.
C-N Bonds (Carbon-Nitrogen Bonds): While nitrogen (N) is an essential element in biological molecules like proteins and nucleic acids (DNA and RNA), it is not a typical component of carbohydrate molecules. Carbohydrates do not contain C-N bonds in their core structure. Nitrogen is usually found in amino acids (the building blocks of proteins), and you'll see C-N bonds in those molecules.
So, the option "B. C-N" is correct in stating that carbohydrate molecules do not typically contain carbon-nitrogen (C-N) bonds in their core structure. Instead, they are primarily composed of carbon, hydrogen, and oxygen atoms, connected by C-C and C-O bonds, which are characteristic of carbohydrates.
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