Human Body Life Tissue Metabolic Cell membrane Human heart Centrosomes Cytoplasm Animals Cell 1. is the basic unit in an organism. 2. is said to be in both plant and animal cells. 3. A is composed of two centrioles. 4. Similar cells group together to perform specific functions and is called 5. Cells carry on many functions to support 6. All the activities of life occur at the cellular level. 7. The is made up of varying parts. 8. The is composed of muscles and blood vessels. 9. has a single set of reproductive organs that they use to sexually reproduce. 10. is a translucent jelly-like substance.