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Explanation:
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Answer: A group of cells that have the same function is called a tissue.
A group of tissues that have the same function is called an organ.
A group of organs that have the same functions is called an organ system
(these are just in case you need them)
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It is by simple diffusion that enables the gases of O2 and CO2 to enter and leave the plant cell. It is because the simple diffusion enables substances to be able to process in which they are able to pass in a membrane. By passing in the membrane, they don't need any help of others or any aid and could pass with simply their own.