The most important condition for the origin of life is the presence of

Eukaryotes developed around

In which era did Protozoa,sponges,and algae originate?

Two statements regarding the origin of life are given below:
$(a)$ The first organisms that emerged on Earth are believed to have been devoid of chlorophyll and incapable of respiration.
$(b)$ The first food-producing organisms were chemosynthetic and never released oxygen.
Based on the above statements,which of the following options is correct?

According to Oparin,life originated as

What was the ratio of methane,ammonia,and hydrogen in Miller's experiment?