Fall leaf color on deciduous trees is a result of
A. the production of more accessory pigments because of the cooler temperatures.
B. the reduction in the production of accessory pigments.
C. cessation of chlorophyll production, which allows the accessory pigments to be revealed.
D. the increased angle of the sun during the fall, which reflects more of the accessory pigments.
C. cessation of chlorophyll production, which allows the accessory pigments to be revealed.
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Which bones are most likely to be hollow in any given species of bird?
a. furcula b. sternum c. skull d. humerus
Some animals have no body symmetry or have __________ symmetry like spokes on a wheel. Fill in the blank(s) with the appropriate word(s)
A substance that, when dissociated in water, will give off hydrogen ions is referred to as a(n) ________
Fill in the blank(s) with correct word
A scientist observes that the height of a certain species of asters decreases as the altitude on a mountainside increases. She gathers seeds from samples at various altitudes, plants them in a uniform environment, and measures the height of the new plants. All of her experimental asters grow to approximately the same height. From this she concludes __________.
a. height is not a quantitative trait b. the trend in height that she observed was due to genetic variation c. the differences in the parent plants' heights were due to directional selection d. the height variation she initially observed was an example of environmental influence e. stabilizing selection was responsible for height differences in the parent plants