Across
- 2. organ of the digestive system that chemically breaks down food
- 5. all bodies of freshwater, salt water, ice and snow found above ground
- 6. anything that causes a reaction or response
- 8. succession where plants begin to grown after a forest fire or deforestation
- 9. body system that brings in oxygen and releases carbon dioxide
- 10. the weak gene
- 11. the number of similar organisms that live in an area
Down
- 1. a group of organisms that are closely related(all dogs)
- 2. reproduction requiring 2 parents and produces diverse offspring
- 3. the behavior that results from the stimulus
- 4. succession that starts with pioneer species growing on rocks
- 7. system that supports the body and protects internal organs