Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.

During the origin and evolution of life, key biological compounds were progressively synthesised in ocean with the help of energy obtainable from

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