Ecology

3. the variety of life in the world or in a particular habitat or ecosystem,
6. The flow of energy that occurs along a food chain
9. The number of people, other living organisms, or crops that a region can support without environmental degradation
11. A nonliving part of an ecosystem that shapes its environment
14. A biological community interacting organisms and their physical environment
15. A particular section,group,or type of people or animals living in an area or country
17. an animal that naturally preys on others
18. a system of interlocking and interdependent food chains
19. a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically
20. the natural home or environment of an animal, plant, or other organism

1. Make up the second trophic level
2. Anything that constrains a population size and slows or stops it from growing
4. A living organism that shapes its environment
5. A non native species whose introduction does or is likely to cause economic or environmental harm
7. The range of different inherited traits within a species
8. an organism,especially a soil bacterium, fungus, or invertebrate, that decomposes organic material
10. an animal that is caught and killed by another for food
12. Each or several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain
13. The branch of biology that deals with the relations of organisms to one another and to their physical surroundings
16. The direct or indirect interaction of organisms that leads to change in fitness when the organisms share the same resource