What are variations ? How do they help organisms?

Explanation

1. Differences in characters within very closely related groups of organisms are referred to as variations.
2. Variations develop during reproduction in organisms.
3. Sexual reproduction and errors in DNA copying leads to variations in offsprings in a population
4. Variations are passed from parent to offsprin through heredity
5 Thus the variations accumulate over the generations
6. Beneficial variations are selected by the nature in evolution
7. these variations increase the survival chance of the organisms. ltBrgt 8. These variations help the organisms to adopt to their environments
9. For example green colour in the beetles in a variation that gave a survival advantage to the beetles as they cannot be seen by the crows
10. Accumulated variations gradually lead to evolution.