Q: What process is the opposite of nitrogen fixation? Read this paragraph and choose the correct option from the provided answers: When plants and other organisms die, decomposers break down their remains. In the process, they release nitrogen in the form of ammonium ions. This process is called ammonification. Nitrifying bacteria change the ammonium ions into nitrites and nitrates. Some of the nitrates are used by plants. The process of converting ammonium ions to nitrites or nitrates is called nitrification. Still other bacteria, called denitrifying bacteria, convert some of the nitrates in soil back into nitrogen gas in a process called denitrification. The process is the opposite of nitrogen fixation. Denitrification returns nitrogen gas back to the atmosphere, where it can continue the nitrogen cycle. Choices: - digestion - respiration - percolation - denitrification A:
denitrification

(Question)
Q: What is the name of the protein that is found in hairs and nails? Read this paragraph and choose the correct option from the provided answers: Along with the skin, the integumentary system includes the nails and hair. Both the nails and hair contain the tough protein, keratin. The keratin forms fibers, which makes your nails and hair tough and strong. Keratin is similar in toughness to chitin, the carbohydrate found in the exoskeleton of arthropods. Choices: - cellulose - chromatin - Skin - keratin A:
(Answer)
keratin

Ques: Q: How often does condensation occur in your cells? Read this paragraph and choose the correct option from the provided answers: Condensation occurs in your cells constantly. It occurs in the form of a chemical reaction. These condensation reactions involve the formation of a water molecule from two other molecules. Water forms when two molecules, such as amino acids or monosaccharides, are joined together. The amino acids join together to form peptides (or polypeptides or proteins) and the monosaccharides join together to form disaccharides or polysaccharides. Choices: - weekly - daily - never - constantly A:
Ans: constantly

(Q).
Q: Which property changes when a glass breaks? Read this paragraph and choose the correct option from the provided answers: When glass breaks, its physical properties change. Instead of one solid sheet of glass, it now has holes and cracks. Choices: - State - Chemical - density - its physical property A:
(A).
its physical property

Ques:Q: What term is used to describe a simple diagram that shows one way energy flows through an ecosystem? Read this paragraph and choose the correct option from the provided answers: A food chain is a simple diagram that shows one way energy flows through an ecosystem. You can see an example of a food chain in Figure below . Producers form the base of all food chains. The consumers that eat producers are called primary consumers. The consumers that eat primary consumers are secondary consumers. This chain can continue to multiple levels. Choices: - water cycle - food pyramid - fuel chain - food chain A:

Ans:food chain

Ques: Q: What happens to cells in a hypertonic solution as water leaves the cell via osmosis? Read this paragraph and choose the correct option from the provided answers: The movement of water molecules is not itself regulated by cells, so it is important that cells are exposed to an environment in which the concentration of solutes outside of the cells (in the extracellular fluid) is equal to the concentration of solutes inside the cells (in the cytoplasm). Two solutions that have the same concentration of solutes are said to be isotonic (equal tension). When cells and their extracellular environments are isotonic, the concentration of water molecules is the same outside and inside the cells, and the cells maintain their normal shape (and function). Osmosis occurs when there is an imbalance of solutes outside of a cell versus inside the cell. A solution that has a higher concentration of solutes than another solution is said to be hypertonic, and water molecules tend to diffuse into a hypertonic solution (Figure 3.8). Cells in a hypertonic solution will shrivel as water leaves the cell via osmosis. In contrast, a solution that has a lower concentration of solutes than another solution is said to be hypotonic, and water molecules tend to diffuse out of a hypotonic solution. Cells in a hypotonic solution will take on too much water and swell, with the risk of eventually bursting. A critical aspect of homeostasis in living things is to create an internal environment in which all of the body's cells are in an isotonic solution. Various organ systems, particularly the kidneys, work to maintain this homeostasis. Choices: - get larger - evaporation - self destruction - shrinkage A:
Ans:
shrinkage