A classic example of natural selection at work is the origin of giraffes’ long necks. The ancestors of modern giraffes were animals similar to deer or antelope, with necks of ordinary length.

Understanding this phenomenon allowed him to develop his concept of “natural selection” which, in turn, became a core element of his theory of evolution. Darwin observed that with such abundance, ...

So the question is, why? How could an animal be so precisely adapted to a particular lifestyle? The answer is natural selection. See, what must have happened, is way back when the ancestors of the ...

Animals also choose their mates, sometimes with a great deal of care. Mating systems are important to understand because they reflect the result of natural selection on mate choice, and ultimately ...

Aa Aa Aa Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population ...

What does ‘survival of the fittest’ mean? In terms of evolution, an animal that is ‘fit’ is one that’s adapted to its environment. This concept is at the core of natural selection, although the term ...