There are how many total races of man
$6$
$4$
$8$
$16$
It's Obvious
Given below some major events in the early history of life
$I.$ First heterotrophic prokaryotes
$II.$ First eukaryotes
$III.$ First autotrophic prokaryotes
$IV.$ First animals
Choose the correct sequence of these evolutionary events
The scientist related with the over throw or the "Theory of spontaneous generation'' and experiments with swan-necked flasks is
The best description of natural selection is
$A$ : Archaeopteryx had free caudal vertebrae and toothed beak with teeth like reptiles. $R$ : It is missing link between reptiles and bird
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