$A$ : Lycaenops is a connecting link between reptiles and mammals.
$R$ : In permian period there was origin of mammal like reptiles.

Theory of abiogenesis or spontaneous generation was finally disapproved by

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

Sympatric speciation is also known as