1) They are organisms that have many cells a) organs b) body systems c) multicellular d) tissues e) unicellular 2) They are layers of the same type of cells a) organs b) body systems c) multicellular d) tissues e) unicellular 3) They are groups of tissues that work together to perform a specific job a) organs b) body systems c) multicellular d) tissues e) unicellular 4) They are several groups of organs working together a) organs b) body systems c) multicellular d) tissues e) unicellular 5) They are the smallest living things with only one cell a) multicellular b) body systems c) unicellular d) organs e) tissues

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