Potassium-argon dating can determine the age of the fossils
Of about $5,00,000$ years old
$2$ billion years old
Of all ages
Of azoic era only
(a) Potassium-argon have half life period as $1.3 \times {10^9}$ years.
A star fish with six arms may be a case of
The most apparent change during the evolutionary history of Homo sapiens is traced in
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