Phospholipids makes up majority of the cell membrane. Transmembrane proteins comes in second place.
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Chemical energy eventually leaves an ecosystem, when the top predator eventually dies. Other plants and animals will use this energy because when the dead body decays, the plants will take some of it through the soil, and put back into the cycle.
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the main difference between the human and cow digestive system is that cows have a ruminant ... In this way, the kangaroo always has sharp teeth up front.
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Contractility is the ability of muscle cells to forcefully shorten.
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