bioindicators

2. - 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.
6. - are a bioindicator, a species ecologists monitor to help gauge how healthy an ecosystem is.
9. WATER SHRIMP - live only in fresh water
10. - the gradual accumulation of substances, such as pesticides, or other chemicals in an organism.
11. WORM - live in slightly polluted water
12. - are considered accurate indicators of environmental stress and the health of biosphere as a whole.
14. - are algae and fungi living symbiotically
15. - observe changes in the populations of animal and plants bioindicators to see if an environment is healthy.
17. BACTERIA - these are used to test water for environmental toxins
18. SYSTEM - an increase or decrease in an animal population may indicate damage to ecosystem caused by pollution.
19. - plant system can be from both higher and lower classes of ________?

1. - used as bioindicator to determine acute toxicity.
3. - are significant component of biological monitoring programs for assessing water quality.
4. - living organisms that respond in an especially clear way to a change environment.
5. SYSTEM - the presence or absence of certain
7. - diverse group of organisms found in large quantities and easier to detect sample.
8. - occurs through a chemical reaction that produces light energy within an organism's body.
11. - have been widely documented as useful indicators of environmental water quality because of their differential sensitivity to polution.
13. - are algae that live in houses made of glass.
16. often used as bioindicators because they are very sensitive to pollution, excess nutrients, increased turbidity, chlorine etc.