What is Evolution?

The Theory of Evolution states that organisms change (evolve) over a long time (from simple life forms) due to natural selection.

Natural Selection: this is based on 3 key points.

1: that there is a lot of differences in animals of the same species (e.g. the different types of dog) this is called genetic variation 

2:  is that organisms with benefical genes  (e.g. for hunting or disease resistance) are more likely to survive in an enviroment

3: these genes that have enabled the organism to survive are passed on to its offspring