The main nitrogenous waste of freshwater fishes is:
a. ammonia.
b. urea.
c. uric acid.
d. amino acids.
e. purines.
a
Biology & Microbiology
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Consider the global nitrogen cycle depicted in the figure above. How are humans altering this cycle?
A) industrial nitrogen fixation B) nitrogen lost to the atmosphere C) reduction of nitrogen available to terrestrial ecosystems D) reduction of nitrogen fixation by bacteria E) permanent burial of nitrogen in coastal environments through runoff
Biology & Microbiology
The only epidermal cells with chloroplasts are:a
stomata. b. stoma. c. parenchyma. d. guard cells. e. all of these
Biology & Microbiology
There are __________ naturally occurring elements.
a. 4 b. 25 c. 92 d. 108 e. 238
Biology & Microbiology
Which is not a greenhouse gas?
What will be an ideal response?
Biology & Microbiology