A population of mountain-dwelling salamanders migrates and splits into two populations separated by a valley they can not cross. The speciation process that may occur is:
A) temporal. B) sympatric. C) behavioral. D) allopatric.
Answer: D
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Viroids differ from viruses in that:
a. they lack RNA b. they lack a viral envelope c. they are much larger d. they do not replicate e. viroid RNA does not encode proteins
Darwin obtained which of the following in the Essay on the principle of Population by Malthus?
A. Organisms are varied and some variations are inherited. B. Populations grow constantly. C. An individual's chance of survival is random. D. Species do not change over time. E. More individuals of a population are born than survive to reproduce.
Which factor increases the likelihood of population extinction?
A. large population size B. isolation of a population from sources of immigrants C. isolation of a population from density-independent effects D. high resource availability E. high genetic diversity
A(n) ________ produces a rapid, automatic motor response to a stimulus.
Fill in the blank(s) with the appropriate word(s).