Explain Darwin's theory of evolution by natural selection; be sure to include the importance of variation.
Darwin collected powerful evidence supporting the fact of evolution i.e. that species have not remained unaltered through time, but have changed. He collected most of this evidence while he was on a five year voyage aboard HMS Beagle which sailed around the world on a map making survey. He argued that if species had arisen by gradual change it should be possible to learn something about their ancestry from the similarities and differences between them, and from their embryology and fossil record.
Next he put forward a plausible hypothesis explaining the mechanism of evolution. He postulated that individuals of a species differ from each other in the degree to which they are adapted to their surroundings. The poorly adapted ones perish whereas the well adapted ones survive and transmit their beneficial characteristics to their ...
Darwin's theory of evolution by natural selection is explained.