Life has existed on earth for the last

2 \cdot 3

billion years

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3 \cdot 5

billion years

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4 \cdot 3

billion years

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5 \cdot 0

billion years

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Solution

The correct option is C $3 \cdot 5$ billion years
Life is a characteristic that distinguishes physical entities that have biological processes such as signalling and self-sustaining processes.
Life on Earth first appeared as early as 4.8 billion years ago. The earliest known life forms are microfossils of bacteria.
Hence life has existed on earth for the last 3-5 billion years.
So, the correct answer is '3-5 billion years ago'.

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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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\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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