What characteristic distinguished Progymnosperms from conifers?
a. a single megaspore within the antheridium
b. the ability to hibernate during droughts
c. reproduction via spore dispersal
d. a strobilus containing a single megaspore
c. reproduction via spore dispersal
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Which of the following are required for evolution to occur?
a. genetic variability in a population b. selection for adaptive traits c. high level of individual fitness d. sexual reproduction e. genetic variability in a population and selection for adaptive traits
The general term that describes the uptake of oxygen from the environment and the disposal of carbon dioxide at the body system level is
A. respiration. B. diffusion. C. exhalation. D. cellular respiration. E. inspiration.
The prokaryote operon model explains gene regulation at the level of
a. replication. b. transcription. c. transcript processing. d. transcript transport. e. translation.
Which biome is characterized by weasels, gray wolves, ptarmigan, musk oxen, and lemmings?
a. tundra b. desert c. tropical rain forest d. savanna e. temperate deciduous forest