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bacteria One-celled living things that lack a nucleus: oldest living thing protists One-celled living things that have a nucleus Examples are Algae and Protozoans organism A living thing microscopic Too small to be seen with the eye alone cell The building block of life vascular Having tubes or channels nonvascular Without tubes or channels vertebrates An animal with a backbone invertebrates An animal without a backbone nucleus Controls the function of the cell chloroplast The part of the plant cell that produces chlorophyll photosynthesis The process in which a plant uses carbon dioxide, water, and light energy from the sun to make its own food