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Alexis23 Alexis23
wrote...
Posts: 547
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6 years ago
A primary source of carbon for photosynthetic organisms is:
  a. carbon dioxide in the atmosphere and water.
  b. bicarbonate in the water.
  c. nitrate in the soil.
  d. dissolved phosphate in water.
  e. carbonic acid in rain.

Question 2

In Figure 55-2, the gull has the highest concentration of DDT because it is:
  a. a more complex organism.
  b. an older organism.
  c. at the bottom of the food chain.
  d. at the top of the food chain.
  e. homoeothermic (warm-blooded). What will be an ideal response?
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Replies
wrote...
6 years ago
Answer to q. 1

A

Answer to q. 2

D
Alexis23 Author
wrote...
6 years ago
I can't even begin to explain how much your help meant to me!
wrote...
6 years ago
Happy to hear that, good luck with the rest of them
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