When the following cross is performed: AaBb x AaBb, the expected phenotypic ratio is A. 4:4:4:4
B. 9:3:3:1
C. 6:6:2:2
D. 7:7:1:1​

the fossil record provides evidence of a common ancestor to many species.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

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