The first cellular form of life did not possibly originate until:

Preformation theory concerning the transmission of characters was given by

The first life on Earth was ...... .

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.

The experiment to prove "chemical evolution" was performed by:

The first organisms to appear on Earth were more like plants because: