Question

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 in the pond. Which of the following best explains the change in guppy size?

A) speciation
B) convergent evolution
C) natural selection

Answer 1

nat·u·ral se·lec·tion the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.