The origin of life on earth can be traced back to nearly ________ years ago.

300 million

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6 million

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13.7 billion

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3.8 billion

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Solution

The correct option is D
3.8 billion

The origin of life on earth can be traced back to nearly 3.8 billion years ago owing to the formation of complex molecules.

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$\begin{matrix} C o l u m n I & C o l u m n I I E v e n t s & T i m e F r a m e A & O r i g i n o f u n i v e r s e & p & 3 b i l l i o n y e a r s a g o B & O r i g i n o f e a r t h & q & 4.6 b i l l i o n y e a r s a g o C & O r i g i n o f s t a r s & r & 10 b i l l i o n y e a r s a g o D & O r i g i n o f l i f e & s & 14 b i l l i o n y e a r s a g o t & 5 b i l l i o n y e a r s a g o \end{matrix}$

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The origin of life on earth can be traced back to nearly ________ years ago.

The correct option is D 3.8 billion The origin of life on earth can be traced back to nearly 3.8 billion years ago owing to the formation of complex molecules.

The correct option is D
3.8 billion

The origin of life on earth can be traced back to nearly 3.8 billion years ago owing to the formation of complex molecules.