Across
- 4. study of animals and surroundings
- 6. one benefits, other unaffected
- 7. makes its own food
- 8. interlocking system of food chains
- 9. both benefit
- 10. plants get energy from it
Down
- 1. one benefits, other harmed
- 2. hunted
- 3. two compete for same
- 5. hunter