Darwin’s theory of natural selection is the idea of evolution it is the way animals have formed from natural selection a mutation of an animal is the way that he predicted that creatures have mutant off springs that benefit there lifestyles such as a parrot on one island has a shorter beak than the other this because of progressive mutation over millions of years have led to the parrot on the first island to have a smaller beak and on the second to have a longer beak this is the process of evolution. This is different to Lamarck’s theory of evolution as he had based his idea on the past off spring had to adapt to the environment. So he would have proposed that a horse had adapted in the Savannah to not being able to reach the leaves high up in the trees having stretched the neck would be longer and over time it would progressively turn into a giraffe. This difference between these two theories is that Lamarck suggested that a certain action during an organisms live time has caused it to change in the next while Darwin had suggested that mutations progressively over millions of years have caused animals to change.

How do organisms evolve?