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Ch. 1 - Cells, the Body Builders

Key Ideas
• a cell is the smallest unit of life
• all living things are made of one or more cells
• cells are organized as tissues, organs, & organ systems in many-celled living things
bacteria - tiny one-celled living things
amoeba - a one-celled living thing that changes shape to move & take in food
oxygen - a gas in air that cells need to live
Learning Master 7