About __________ of the total energy the sun releases strikes the atmosphere
a. one-tenth
b. one-hundredth
c. one-thousandth
d. one-millionth
e. one-billionth
E
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Charles Darwin proposed the theory of evolution based on data he collected during:
a. the Beagle expedition. b. the Challenger expedition. c. the observations of Agassiz. d. Alvin's dives. e. his time spent on the rocky coastline of England.
Which of the following has the highest species richness? A community with
A) 34 species of high evenness. B) 36 species with very low evenness. C) 35 species of high evenness. D) 33 species of low evenness.
The light-capturing events of photosynthesis involve
A. the stroma. B. mitochondria C. cytoplasm. D. chlorophyll.
Which structure in bird and mammalian embryos functions like the blastopore of frog embryos?
A) primitive streak B) neural plate C) archenteron D) notochord E) somites