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, the population ...

Discover the science behind natural selection and evolution. Get the facts on survival of the fittest with ExtremeTech’s ...

Change can also occur by genetic drift or gene flow. 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 ...

Natural Selection: The Idea The best way to appreciate evolution by natural selection is to consider organisms whose life cycle is short enough that many generations can be observed.

Lauren Schroeder studies the processes that have driven human evolution. She has a tattoo of her favorite fossil, a 2-million-year-old Homo habilis skull.. Blake Eligh/University of Toronto ...

The early evolution of the genus Homo, which is estimated to have emerged 2.8 million years ago, is characterized by variation in fossils. In the past, this has been attributed to natural selection.

As a species, we have not shed the influence of evolution by natural selection — both bad and good. But evolution has not only led to challenges in our ability to behave morally.

In interviews, Fair suggested that natural selection is only a theory, other theories of origins should be presented, we should “teach the controversy,” and selection leads to “Darwinism ...

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, the population ...