Across
- 4. Aquatic animals that have gills and lay eggs.
- 6. Group of living organisms that reproduce with each other.
- 7. Ability to have offspring.
- 8. Study of hormones and how it controls body functions.
Down
- 1. Chemical messenger made by glands.
- 2. Surroundings (water, temperature) that affect how organisms live and function.
- 3. study of how organs and systems in living things function.
- 5. Study of microscopic tissue.