Question: How do organisms evolve?

Chloe Kinsella answered on 12 Nov 2014:

Evolution is the change in organisms over time. All plants and animals contain DNA. From time to time a small part of DNA can change, sort of by accident. This is called a mutation. This mutation may cause a change in an animal (for example it may grow white fur instead of brown, or may become smaller). If the mutation causes a good change, then this animal will survive and have a better chance of reproducing, passing its DNA onto its offspring. If the mutation causes a bad change in an animal it will not survive as weell and it will have less of a chance of reproducing offspring.

If mutations are beneficial they have a much better chance of being passed on from parent to offspring, and this process is called natural selection. As mutations in DNA are passed on this causes a species to evolve, sometimes into a completely new type of species.