In his experiments for the origin of life,Miller obtained

Which amino acid was not formed in Miller's experiment?

How many years ago did invertebrates originate (in $mya$)?

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

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?

Which scientist proposed the most logical biochemical theory for the origin of life?