Proteins in the cell membrane provide the structural support aspect. There are also channel proteins in the cell membrane that help substances pass through the cell membrane.
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Members of one kind of organism in a ecosystem are called a population.
The basic needs of all cells in the body are food and water. Just like any other organism, cells live of of nutrients and water collected in one way or another.
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I think the answer will be:
D.random loss or gain of genes
