alleryAccording to the text, life is said to have been non-existent on the Earth until approximately how long ago?
A3.5 billion years ago
B3.5 million years ago
C3.5 thousand years ago
D3.5 hundred years ago
Answer & Solution
Correct answer: A. 3.5 billion years ago
1. The text describes the early lifeless ocean stage of the Earth.
2. It states life had been non-existent until about 3.5 billion years ago.
3. Simple compounds then gradually formed the first cells.
4. Hence the time scale is 3.5 billion years.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.12_
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