Which embryonic cell layer develops into the lining of the gut in most metazoans?
a. mesoglea
b. ectoderm
c. endoderm
d. epiderm
Ans: c. endoderm
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Fermentation ________.
A. only occurs in aerobic organisms B. is equivalent to aerobic respiration in ATP production C. requires an organic electron acceptor D. requires oxygen E. is the same as anaerobic respiration
A mass extinction, perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula in the Cretaceous period, produced_____________, which created uninhabitable conditions.
A. active tectonic plate movements that rapidly repositioned continental plates B. All of the answer choices are correct. C. massive volumes of soot, and triggered major climate changes D. forest and range fires over hundreds of years E. a large numbers of volcanic eruptions for millions of years
Living organisms are members of all of the levels listed below. However, rocks are components of
a. the community. b. the population. c. the ecosystem only. d. the biosphere only. e. both the ecosystem and the biosphere.
Monoculture is associated with
A. intraspecific hybrids. B. clones. C. single species. D. All of these answers are true.