The atmosphere became oxidising with the appearance of

Assertion : Coacervates are believed to be the precursors of life.
Reason : Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.

On primitive Earth,oxygen combined with $........$ to produce water and carbon dioxide.

Read the following statements and find out the correct ones:
$A.$ Spontaneous generation theory was approved once and for all.
$B.$ Pasteur showed that in pre-sterilized flasks,life did not come from killed yeast.
$C.$ Oparin observed the formation of amino acids by creating electric discharge in a closed flask.
$D.$ Life appeared $500$ million years before the formation of the earth.

Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

Given below are 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.