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
Answer: A
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Ecologists use compartment models to
a. describe grazer food webs. b. describe detrital food webs. c. describe nutrient cycling d. describe species richness e. describe inputs of solar energy
Which of these adaptation(s) is (are) unique to
mammals? a. hair or fur b. four types of upper and lower teeth that match up c. sweat glands d. secretion of milk by females e. all of these
If an entire genome is fragmented and then a large number of pieces are sequenced, the approach is known as the ________ approach
Fill in the blank(s) with correct word
Which step of the citric acid cycle requires both NAD+ and ADP as reactants?
A) step 1
B) step 2
C) step 3
D) step 4