The first form of life originated in . . . . . . .

The swan-necked flask experiment was performed by ...........

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

The first cell produced on Earth is:

Which of the following was most likely to have been absent in free form in the primordial atmosphere at the time of the origin of life?

In the present time,life cannot originate from inorganic materials because: