Natural selection can act on a certain trait only if the trait is
A) heritable.
B) morphological.
C) behavioral.
D) new.
E) favorable.
A
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Which of these is the best example of an umbrella species?
A. northern spotted owl. B. brown tree snake. C. humpback whale. D. giant panda. E. Gopher tortoise.
Four of the five answers listed below are characteristic of meiosis. Select the exception
a. involves two divisions b. reduces the number of chromosomes c. results in producing genetically identical cells d. produces haploid cells e. occurs in the gonads
Chlorine and ethylene oxide are sterilizing gases.
Answer the following statement true (T) or false (F)
The purpose of the voyage of the HMS Beagle was to
A. survey the living creatures on islands only. B. map navigational routes around the coasts of South America. C. discover new routes to the New World. D. search for gold.