Across
- 3. vital organ located inside the chest
- 7. study of bodily structures
- 9. the ability to maintain a relatively stable internal state that persists despite changes in the outside world
- 10. large molecules composed of one or more chains of amino acids
- 12. respiratory organs located inside the chest
Down
- 1. a group of tissues working together to perform an activity
- 2. the highest level of organization
- 4. biological catalyst that is usually a protein
- 5. study of bodily functions
- 6. a group of cells that perform the same basic activity
- 8. organ located inside the skull
- 11. smallest functional unit of an organism