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Earth was supposed to have been formed about 20 billion years back.

The first organisms on the face of earth were photoautotrophs.

A huge explosion is believed to be the cause of the formation of Universe.

Ozone formed immediately after the formation of earth and acted as shield.

answer is C.

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Detailed Solution

The Big Bang theory attempts to explain to us the origin of universe. It talks of a singular huge explosion unimaginable in physical terms.

Ozone formed much later after the formation of earth. Oxygen and ozone were absent in the primitive atmosphere.

The first organisms on the face of earth were chemotrophs. Phototrophs appeared later.

Earth was supposed to have been formed about 4.5 billion years back.

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