Q. Match the following:
Column I Column II
Origin of the Earth (I) 3 billion years ago
Origin of the Universe (II) 4.5 billion years ago
Origin of first cellular life form (III) 20 billion years ago
Origin of first non-cellular life form (IV) 2 billion years ago

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Solution:

Big Bang Theory explains the origin of universe which have been occurred about 20 billion years ago. The origin of Solar system and the earth supposed to have been formed about 4.5 billion years ago. First non-cellular form of life have been originated about 3 billion and first cellular form of life have been originated about 2 billion years ago.