Unit 9 choice board

3. refers to the variety of life on Earth at all its levels, from genes to ecosystems
4. large environment generally characterized by various abiotic factors
6. an area of land with a similar climate that includes similar communities of plants and animals
8. Situation in which the number of individuals of a given species exceeds the number that its environment can sustain
9. the initial movement of simple organisms, known as pioneer species, into new habitats that have been created
14. an organism that helps hold the system together
15. a previously occupied area is re-colonized following a disturbance that kills much or all of its community
16. those that live in a limited area, such as a mountain range, lake or island, among others
18. when chemicals, particles, or other materials are released into the environment, harming the organisms there
19. Having no light
20. two species can't coexist if they occupy exactly the same niche

1. the species that first colonize new habitats created by disturbance
2. An ecological community in which populations of plants or animals remain stable and exist in balance with each other and their environment
5. all of the food chains in an ecosystem
7. partially enclosed, coastal water body where freshwater from rivers and streams mixes with salt water from the ocean
10. an organism that causes ecological or economic harm in a new environment where it is not native.
11. Having light
12. the purposeful clearing of forested land
13. complex life form that is a symbiotic partnership of two separate organisms, a fungus and an alga
17. relating to water; living in or near water or taking place in water