Ecology

3. each step in a food chain
4. one lives on or inside other organisms and harms it
6. organism that captures energy from sunlight and use energy to produce food
7. one member benefits, others not affected
9. links all food chains in an ecosystem
11. group of organisms that can breed and have fertile offspring
12. series of steps where organisms transfer energy by eating are being eaten
13. both benefit
17. eat plants
18. scientific study of interaction between organisms and their environment

1. substances an organism needs to sustain life
2. an organism's job
3. water evaporating from leaves of plants
5. any relationship between where two species live closely together
7. collection of different populations that live together in same area
8. collection of all organisms that live in same place with nonliving environment
10. eat animals
14. organisms that make their own food
15. eat plants and animals
16. total amount of living tissues within a tropic level