Does this experiment support or refute the conclusion that prairie dogs are a keystone species?
a. It seems to refute the conclusion that prairie dogs are a keystone species because otherspecies declined after prairie dogs re-established
b. It seems to support the conclusion that prairie dogs are a keystone species because otherspecies declined after prairie dogs re-established.
c. It seems to support the conclusion that prairie dogs are a keystone species because otherspecies increased after prairie dogs re-established.
d. None of the above (because the results were inconclusive).
c
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All living things need carbon. How does most carbon enter the living portion of an ecosystem?
A. Atmospheric CO2 taken in by photosynthesis B. Elemental carbon taken in by plant roots C. Elemental carbon taken in by plant leaves D. Atmospheric CO2 taken in by soil bacteria
If you see a yellow flower with "nectar guide" stripes best seen in ultraviolet light and with a strong,
sweet odor, it is likely pollinated by ____.
a. flies b. birds c. bats or moths d. butterflies e. bees
Which of the following is true of histamine?
a. causes blood vessels to contract b. causes capillaries to lose their permeability c. causes an outward flow of fluids from the capillaries d. reduces tissue swelling e. causes cells to release interferons
On the basis of the principle of complementary base pairing, you would expect the percentage of _____ to be equal to the percentage of _____.
a. adenine ... thymine b. adenine ... guanine c. thymine ... guanine d. adenine ... cytosine e. thymine ... cytosine