How does the evolution of organisms have taken place?

Explanation

1. Variations which are beneficial are selected by the natura and passed from parents to offspring through heredity.
2. the same process happens with every new generation until the variation becomes common feature.
3. As the enviroment changes, the organism within environment adapts and changes to the new living conditions.
4. over a long period of time, each species of gorganisms can accumulate so many changes that it becomes a new species.
5 Thus evoutin of organisms too place from common pre -existing ancestors.