O bjective 14 14. Briefly describe Darwin's theory of evolution as a struggle for survival and be able to cite present-day examples.
Evolution is change over time.
A Discussion of Biological Evolution. Biological evolution is a theory which refers to changes or adaptations of organisms over time. It refers to a scientific idea which has been tested many times and which has strong support for its veracity. At the same time, scientists understand that new evidence may appear and then the theory may be changed or modified in light of this new information. Again, the modification must go through the rigors of repeated testing.