The danger of carcinogens lies in their effect on A) ...

[casperchen82]

The danger of carcinogens lies in their effect on
 
  A) oxygen-carrying red blood cells.
  B) the ability of the lining of the lungs to absorb oxygen.
  C) DNA molecules inside cells.
  D) the ability to absorb nutrients in the wall of the intestines.

Question 2

Many polluted ecosystems, such as those suffering from eutrophication, will recover if humans stop polluting them. This illustrates
 
  A) loss of ecosystem capital.
  B) the essential role of keystone species in ecosystems.
  C) secondary succession.
  D) the natural resilience of ecosystems.

[aham8f]

Answer to Question 1

C

Answer to Question 2

D

[casperchen82]

Excellent

[Viet Thy]

Thanks for the timely response, appreciate it