A)Natural selection works on variation already present in a population.
B)Natural selection works on non-heritable traits.
C)Individuals evolve through natural selection.
D)Individual organisms evolve structures that they need.

A)Its purpose was to identify the fastest route from the Atlantic to the Pacific Ocean.
B)It lasted almost 2 years.
C)It turned into a tremendous opportunity for Darwin to collect fossils, plants, and animals.
D)It ended with the sinking of the ship off of the coast of Australia, almost 4 years into its journey.

A)the forelimb of a dog and the hindlimb of a cat
B)the forelimb of a dog and the forelimb of a cat
C)wings of a butterfly and wings of a sparrow
D)the mouth of a mosquito and the beak of a hummingbird