Which of Darwin's postulates about evolution by natural selection is most directly related to heritable variation?
A. Individuals that survive are not a random sample of the population.
B. The individual organisms that make up a population vary in the traits they possess.
C. An individual's phenotype can change in response to a challenge from the environment.
D. In each generation, many more offspring are produced than can possibly survive.
Ans: B. The individual organisms that make up a population vary in the traits they possess.
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