An adaptive trait is a trait that has
a. mutated.
b. survival value.
c. decreased in frequency in a population.
d. deleterious biological effects.
e. the potential to produce variation.
Answer: b
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Regarding megafaunal extinctions, it is assumed that the driving factor was
A. climate change. B. the Ice Age. C. Homo sapiens. D. a meteorite. E. rising sea levels.
The first plants clearly evolved from an organism that, if it existed today, would be classified as a multicellular green ___________.
Fill in the blank(s) with the appropriate word(s).
Members of the hyperthermophilic anaerobe lineage are known to reside in marine and terrestrial geothermal habitats.
Answer the following statement true (T) or false (F)
When the left atrium is contracting ____
a. the left ventricle is contracting b. the right atrium is contracting c. blood is moving away from the heart d. blood is leaving the left ventricle e. the bicuspid valve is closed