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Natural selection is differential _________________ reproduction among individuals in a _____________ due to differences in ______________, which are said to be adaptive. Individuals with the adaptive _________ have a reproductive advantage (increased reproductive fitness); therefore, they contribute a disproportionately high number of progeny to the next ________. The adaptive ____________ and the underlying _____________ will increase in frequency in the _____________ over time.

a. mutation
b. reproduction
c. population
d. generation
e. genotype
f. phenotypes
g. phenotype