About half a billion years ago, early animals in the oceans and seas struggled to survive in a world that experienced ...

The questions "What are species?" and "How do we identify species ... In this page, you will learn about variation within gene pools, as well as the ways in which this variation can be an ...

"I expected some variation." Scientists stunned by striking behavior shift across hundreds of animal species: 'That is not always correct' first appeared on The Cool Down.

The variation within a single species has produced differences as large as those between two separate species. Some critics of the theory of evolution argue that it doesn't convincingly explain ...

Environmental stress in evolution can be reframed as a powerful engine of innovation, not simply a barrier to survival.

This is called environmental variation. Humans, dogs and goldfish are examples of species. Different species have different characteristics from each other. For example, dogs have tails and humans ...

Genetic variation within a population is measured according to the number of different alleles of all genes and the frequency with which they appear. Variation is high when there are many ...

Identify how animals and plants are adapted to suit their environment in different ways and that adaptation may lead to evolution. Recognize that characteristics are passed from parents to their ...

There are, however, rare examples of asexual species that reproduce by cloning. Each offspring is genetically identical to the parent, with little variation generation after generation.