Key terms in Ecology

3. the dry mass of living material
5. the biological factors in an environment that affect the organisms living there
7. a square frame used for sampling abundance and distribution of organisms in the field
10. a visual representation of the feeding relationships within a habitat
12. biological community of living organisms that interact with each other and the environment around them
14. the interaction between organisms that share a limited resource
16. all the organisms living in an ecosystem
17. a group of organisms that is capable of making its own food, autotrophs
18. the biotic and abiotic factors that affect the organisms in an area

1. areas within an ecosystem where individual species live
2. the measure of how spread out organisms are within an area
4. a measure of the variety of organisms in an area
6. the position of an organism in a food chain
8. the physical factors in an environment that affect the organisms living there
9. a group of organisms that break down dead organic matter
11. the act of hunting and feeding on another animal
13. the measure of population size
15. a group of individuals of the same species within an ecosystem