Across
- 5. a body system that allows for movement by contracting.
- 8. the purpose of the nervous system is to gather and respond to ___________.
- 9. a body system that brings oxygen into our bodies and sends carbon dioxide out.
- 10. the normal range of body levels.
- 11. the ____________ system prevents species from becoming extinct.
- 12. the building blocks of life.
Down
- 1. when it gets cold, your body _______ to generate heat.
- 2. a body system that provides shape and support.
- 3. the ______ system fights off foreign invaders in the body.
- 4. every _____ is made up of different tissues.
- 6. processes that regulate body levels and maintain stability.
- 7. a body system that takes in food and absorbs nutrients.