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When warm, wet air rises, it cools, and water vapor condenses out to form clouds. A cloud is made up of small drops of water or ice crystals, depending on its height and how cold is the surrounding air.
Answer:
The correct answer is option d, that is, endocytosis.
Explanation:
A procedure in which a component gains entry within the cell without getting passed through the cell membrane is termed as endocytosis. In this process, the cell captivates the substances from the external of the cell by engulfing and combining them with its plasma membrane.
The process is further differentiated into three distinct kinds. These are phagocytosis, pinocytosis, and receptor-mediated endocytosis.
Simple passive diffusion occurs when small molecules pass through the lipid bilayer of a cell membrane. Facilitated diffusion depends on carrier proteins imbedded in the membrane to allow specific substances to pass through, that might not be able to diffuse through the cell membrane.
Answer: <u>Option C
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Animals moving in packs or flocks, try to utilize the energy efficiently. The same case is with birds moving in V shape. They use the energy of the air around them, so that air pressure could help them fly with less input of energy. V shape pattern is more aerodynamically energy efficient.
Also, while flying there are no chances of finding mates for reproduction, so option A and B are incorrect.