1]According to the theory of evolution by Darwin evolution is a nut shell.
2]Any group of population of an organism develops variations and all members of group are not indentical.
3]Variations are passed from parent to offspring through heredity.
4]The natural selections over abundance of offspring leads to a constant struggle for thieir survial in any population.
5]As the environment changes,the organism within the environment adapt and changes to the new living conditions.
6]Evolution is a slow and continous process.