Cells can only use ____ that are small enough to enter a cell. The respiratory system brings in ____ molecules from the air. These oxygen molecules are already small enough to fit into cells. The ____ system brings in food and breaks it down into smaller molecules, such as glucose and amino acids, that can fit into cells. The ____ system transports glucose, oxygen, and amino acid molecules to every cell in the body. The body takes in molecules by ____ and ____. The body requires ____ to function. In order to release energy, cells in the body need both ____ and ____ molecules

Metabolism Key Concepts

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