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- The cell is the basic unit of all living things. Some organisms like Amoeba and bacteria are only one cell. Viruses are sub-cellular. Plants and animals are multicellular. Analyze how this fact is important when considering how different organism feed, respire, and excrete. Give two examples for each characteristic and use a multi- cellular organism and a uni-cellular (one-celled) organism to compare.a state is a organisia that consistant internal envirment is called?Explain the difference between a one-celled organism and single cells of a multicellular organism please include structure and function.