-ability to react. (Irritability-Short Term). (Adaption-Long Term)
-physically moving or moving inside the body
- Increase # of cells. Increase in size. Differentiation- cells change into types, or forms, or functions
-chemical reactions happening in the body. Anabolism
- Adding molecules to make something bigger. Catabolism
- Cut bigger molecules into smaller bits.
- Reproduction- make more of ourselves
- Waste Removal- what the body eliminates