Bipedalism was made possible by
a. movement of the foramen magnum to the base of the skull.
b. position and shape of the knee.
c. position and shape of the ankle joints.
d. position and shape of the pelvic girdle.
e. all of these.
E
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Recall that Clements's view of biological communities is that of a highly predictable and interrelated structure, while Gleason's view of biological communities is that individual species operate independently
If we set up many identical sterilized ponds in the same area and allowed them to be colonized, what should we predict if we wished to test Gleason's hypothesis? A) Identical plankton communities will develop in all ponds. B) Similar plankton communities will develop in all ponds. C) Different plankton communities will develop in all ponds. D) Limited plankton communities will develop in all ponds. E) Initially the number of species in each pond will be greater than the number normally found in similar environments.
The cell wall is a common feature to
A. prokaryotic cells only. B. plant cells only. C. animal cells only. D. prokaryotic and plant cells. E. prokaryotic, plant, and animal cells.
The wide variation in skin color in humans is best explained by
a. environmental changes like improvements in diet. b. genetic drift. c. skin color is a polygenic trait. d. crossing over. e. artificial selection.
The end product of a gene's expression blocks additional transcription of the gene. This is an example of:
A) positive control. B) activation energy. C) negative control. D) mutation. E) natural selection.