The abiogenesis occurred about how many billion years ago
$1.2$ billion
$1.5$ billion
$2.5$ billion
$3.5$ billion
It's Obvious
Which one of the following sets represents the correct sequence of the evolution of man
In the developmental history of mammalian heart, it is observed that it passes through a two-chambered fish-like heart, three-chambered frog-like heart and finally four-chambered stage. To which hypothesis can this above cited statement be approximated
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