During which of the following time periods does a CAM plant take in atmospheric CO2?
a. daylight only
b. in darkness only
c. noon to midnight
d. midnight to noon
e. all 24 hours of a standard calendar day
B
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Which of the following premises forms the basis of the concept of molecular evolution?
A) The molecules of life all evolved in the same approximate time span. B) Species that have very similar DNA sequences probably share recent ancestors. C) Species coevolved similar DNA sequences by chance. D) All genes have the same mutation rate.
Approximately what percent of the energy that
enters a trophic level becomes available to the next trophic level? a. 2 to 12 b. 3 to 13 c. 4 to 14 d. 5 to 15 e. 5 to 30
What do ferns lack?
a. seeds b. rhizomes c. chloroplasts d. vascular tissue e. sexual reproductive cycle
If a hiker picked up a mollusk on a trail in a rain forest, what class would it belong to?
A. Polyplacophora B. Cephalopoda C. Gastropoda D. Bivalvia