The guppy is a species of small freshwater fish. Scientists observed that the average size of guppies in a pond decreased over a few years after a guppy predator was introduced into the pond. Which of the following best explains the change in guppy size?
Natural Selection is the best way to explain the change in guppy size. Natural Selection is the way a species reproduce and survive due to the differences in a phenotype (height, size, color, etc).
