The evolution of unicellular organisms occurred in which era?

The concept of chemical evolution is based on which of the following?

Which of the following amino acids was not found to be synthesized in Miller's experiment?

The Big Bang theory was proposed by:

Stanley Miller simulated the conditions of pre-biotic Earth using a spark-discharge apparatus. Which organic compounds were observed by him upon analyzing the end product of his experiment?

First autotrophs on the primitive earth was/were