Three main tenets

01

02

03

Nature's imperfect reproductive methods regularly produce mutations, so that there are always unique individuals.

Individuals which, as a result of those mutations, are better adapted to their environment will have more offspring, either because they survive more often or are better able to attract mates.Those more suitable adaptations will be prone to spreading through an entire population.

Over time, as those adaptations accumulate, populations are modified into new species.

Given the immense amount of geologic time on this earth, this process, known as natural selection, has produced all life on the earth from one or a few parents.