Biology

3. orgs. that are of the same kind
6. the species that first colonize new habitats created by disturbance
8. deals with the relations of organisms to one another and to their physical surrounding
11. limits the reaction rate in any physiological process governed by many variables
14. a biological community of interacting orgs.
16. physical rather than biological
17. relating to or resulting from living things
18. the number of orgs. per unit of area
19. the process by which a plant or animal community successively gives way to another until a stable climax is reached
20. one benefits and the other is harmed
21. all the inhabitants of a particular area

1. a group of people living in the same place
2. interaction between two different organisms living in close physical association, typically to the advantage of both
4. the preying of one animal on others
5. the action of coming to live permanently in a foreign country
7. an animal that naturally preys on others
9. one benefits and the other derives neither benefit nor harm
10. the act of leaving one's own country to settle permanently in another
12. an animal that is hunted and killed by another for food
13. interaction between organisms, populations, or species, in which birth, growth and death depend on gaining a share of a limited environmental resource
15. symbiosis that is beneficial to both organisms involved