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1. Why did major morphological innovations (body plans) evolved earlier in the history of life while...

1. Why did major morphological innovations (body plans) evolved earlier in the history of life while later periods with equal rates of diversification simply produced modifications of existing body plans?

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The major evolution earlier in history produced a feature which is compatible and best adapted to the existing conditions on earth for the animal to survive. This is why once a basic body plan has been developed which is best suited and most useful for the organisms, there is no large scale changes seen in it. This naturally selected feature in organisms undergoes modifications of existing parts in order to adapt to even more specific conditions in nature. The cost of changing the entire feature will be high for the organism.

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