Chapter 3 section 1

Term Definition
cells Cells are the basic units of structure and function in living things.
cell theory A widely accepted explanation of the relationship between cells and living things.
unicellular Made of a single cell
multicelular Consisting of multiple cells
tissue A group of similar cells that perform the same function
organ A structure in the body composed of different kinds of tissue.
organ system a group of organs that work together to preform a major function in the body.

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