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6.Evolution
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Photosynthetic bacteria evolved on earth about ....... million years ago
A
$3300$ to $3500$
B
$3000$ to $ 3300$
C
$3500$ to $3800$
D
$3800$ to $4000$
Solution
(b)Because in the Archeozoic era or $3000$ to $3300$ million years ago, these bacteria were present. Fossils of Cyanobacterium and photosynthetic bacteria have been found which are $3000$ million years old.
Standard 12
Biology
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