Seed ferns originated in

According to Oparin,which one of the following was absent in the primitive atmosphere of the Earth?

$A$: Theory of biogenesis explains that life arises from pre-existing life. $R$: Louis Pasteur finally disapproved the theory of spontaneous generation of life.

Who contributed to the theory of chemical evolution in the origin of life?

The formation of a new species is associated with which trait?

Oxygen combined with which of the following to form water,carbon dioxide,and other compounds during the early evolution of the Earth?