The classical example of adaptive radiation in development of new species is

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

Which is the largest known fossil of reptile

The embryonic development of an animal from the zygote to the adult stage is known as

The correct meaning of natural selection is