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