bioindicators

3. occurs through a chemical reaction that produces light energy within an organism's body.
5. are algae that live in houses made of glass.
7. used as bioindicator to determine acute toxicity.
8. are significant component of biological monitoring programs for assessing water quality.
11. are a bioindicator, a species ecologists monitor to help gauge how healthy an ecosystem is.
15. living organisms that respond in an especially clear way to a change environment.
16. these are used to test water for environmental toxins
18. live only in fresh water
19. an increase or decrease in an animal population may indicate damage to ecosystem caused by pollution.
20. diverse group of organisms found in large quantities and easier to detect sample.

1. the presence or absence of certain
2. have been widely documented as useful indicators of environmental water quality because of their differential sensitivity to polution.
4. often used as bioindicators because they are very sensitive to pollution, excess nutrients, increased turbidity, chlorine etc.
6. is the increasing concentration of a substance, such as toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain.
9. are considered accurate indicators of environmental stress and the health of biosphere as a whole.
10. are algae and fungi living symbiotically
12. plant system can be from both higher and lower classes of ________?
13. observe changes in the populations of animal and plants bioindicators to see if an environment is healthy.
14. the gradual accumulation of substances, such as pesticides, or other chemicals in an organism.
17. live in slightly polluted water