The first cellular life appeared on Earth about ......... years ago.

Which of the following statements is incorrect regarding Miller's experiment?

The theory of panspermia was proposed to explain the

The history of the Earth is equivalent to which of the following?

In the origin of life,microspheres are the most primitive protobionts,which have a membrane of

According to the theory of chemical evolution (often discussed in the context of the origin of life), which of the following represents a logical sequence of the formation of complex molecules?