The simple food chain: grass ? zebra ? lion can be represented by ____ pyramid(s)
a. an energy
b. a height
c. a biomass
d. energy and height
e. energy and biomass
ANSWER: e
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Sulfate-reducing bacteria are a ________ that are found in ________ environments
A) monophyletic group / anoxic B) polyphyletic group / oxic C) morphologically distinct group / anoxic D) morphologically distinct group / oxic
Four of the five answers listed below are related by a similar sensation. Select the exception
a. incus b. organ of Corti c. tectorial membrane d. oval window e. Pacinian corpuscle
Watching salt crystals form as ocean water evaporates, a student says, "Lookâmore and more crystals are appearing. The ocean water is alive!" Which statement is an accurate evaluation of the student's remark?
A) The student is correct: Crystals are ordered structures and they are reproducing, so the ocean water is alive. B) The student is correct because crystals are formed by processing energy from the sun to create new structures, so ocean water is alive. C) The student is incorrect because the solution is processing energy from the sun rather than gaining energy from other organisms, so the ocean water is not alive. D) The student is incorrect because all of the crystals reproduce the same kind of crystals with no variation to provide adaptation, so the ocean water is not alive.
The molecular clock is limited in its usefulness for estimating relationships among spe-cies:
a. saturation of DNA sequences. b. variation in substitution rate between lineages and loci. c. small population sizes. d. A and B. e. All of the above.