$A.I.$ Oparin wrote

In which era was there no presence of life?

The presence of salts ($NaCl$ and others) in animal body fluid gives an inference that life originated in the

The principle of sterilization is based upon experiments carried out by

At the time of the origin of life on Earth,which of the following was absent?

Assertion : Organic compounds first evolved in earth required for origin of life were protein and nucleic acid.
Reason : All life forms were in water environment only.