Over generations of time apart on different islands with different food sources, the separated populations of Galapagos finches accumulated genetic differences until each group had different beaks. This is an example of _____.

Individuals undergo evolution.

A phenotype that improves an organism’s chance of survival in their environment is considered a(n) ____________.

Which of the following is NOT an example of natural selection?

The pelvic bone of whales is not needed for movement within the water. This is an example of a(n) ______________ structure.

The forelimbs of mammals have similar anatomy because these groups descended from a recent common ancestor. Their bone structure is an example of a(n) ______________ structure.

Many different groups of organisms have wings, even though they do not share a recent common ancestor. This is because they evolved in environments with similar selective pressures. Wings are an example of a(n) ______________ structure.

A flood drowns a large portion of an insect population, with only a few random individuals surviving. This is an example of ______.