Who conducted experiments on evolution to prove that life originated from biochemicals for the first time?

Earth is believed to have been formed in the solar system of the galaxy named $P$ about $Q$ years ago.
$\quad\quad\quad P \quad\quad Q$

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.

It is still a favorite idea for some astronomers.

The evolution of unicellular organisms occurred in which era?

The first cell produced on Earth is: