Both plant and animal cells have membranes so whatever chemical reactions they have going inside the cell, it is regulated and maintained. Membranes help separate the internal environment from the external environment.
Hope this helps - I'm currently in cell biology so this question is interesting
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The role of cholesterol in the cell membrane is to maintain stability, anchor other molecules, and keep the membrane fluid in cold temperatures.
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Sorry if it isn't right.
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The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.
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that way the cubs grow up to reproduce and can keep the lion population growing.
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Solids have definite shapes, and liquids fill their containers.
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