Across
- 3. a system of interlocking food chains
- 7. an organism that takes energy from the sun to make its own food
- 8. relating to water
- 9. the cycle of matter being transfered
- 12. makes up all matter
- 13. where a producer gains energy
Down
- 1. of the Earth
- 2. the number of different plants and animals in an ecosystem
- 4. where an organism is placed on a food chain
- 5. needed for an organism to do work or complete a task
- 6. an organism that eats other organisms for energy
- 10. turning old matter into something new
- 11. the smallest unit of life