Write a short note on Organic evolution.

1.	Write a short note on Organic evolution.
Answer» On earth, firstly single celled organisms were formed. Then multicellular organisms were originated from them. Earlier, these were simple, but in gradual development became complicated. All animals were initially without a back bone. Fishes grew from them, by which amphibians were developed. From these evolved reptiles who ruled on the earth millions of years. Thereafter, some reptiles developed into birds and other in mammals. Animals from one class to another takes thousands of years to develop. Similarly, the evolution in plants also take place.

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