bioindicators

3. - are algae that live in houses made of glass.
5. - plant system can be from both higher and lower classes of ________?
8. - are a bioindicator, a species ecologists monitor to help gauge how healthy an ecosystem is.
10. - are algae and fungi living symbiotically
11. - diverse group of organisms found in large quantities and easier to detect sample.
12. - living organisms that respond in an especially clear way to a change environment.
13. SYSTEM - an increase or decrease in an animal population may indicate damage to ecosystem caused by pollution.
14. - are considered accurate indicators of environmental stress and the health of biosphere as a whole.
16. - are significant component of biological monitoring programs for assessing water quality.
19. - used as bioindicator to determine acute toxicity.
20. - observe changes in the populations of animal and plants bioindicators to see if an environment is healthy.

1. - occurs through a chemical reaction that produces light energy within an organism's body.
2. BACTERIA - these are used to test water for environmental toxins
4. often used as bioindicators because they are very sensitive to pollution, excess nutrients, increased turbidity, chlorine etc.
6. WORM - live in slightly polluted water
7. - the gradual accumulation of substances, such as pesticides, or other chemicals in an organism.
9. - 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.
15. SYSTEM - the presence or absence of certain
17. - have been widely documented as useful indicators of environmental water quality because of their differential sensitivity to polution.
18. WATER SHRIMP - live only in fresh water