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Q.

The Earth is supposed to have originated about

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a

4.5 billion years ago 

b

20 billion years ago

c

500 million years ago

d

200 million years ago

answer is D.

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Detailed Solution

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The Earth is supposed to have originated about 4.5 billion years ago. The universe originated about 20 billion years ago. Invertebrates originated about 500 million years ago. Ichthyosaurs originated about 200 million years ago.

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