The evolution of unicellular organisms occurred in which era?

The theory that living organisms on the earth came from outer space is based on the study of

The concept of chemical evolution is based on $ . . . . . . $.

The proponent of the theory of spontaneous generation was

In his experiment,Miller used a specific mixture of gases in the reaction chamber. Which of the following combinations did he use?

Which of the following is the correct sequence of events in the origin of life?