What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it differ from the atmosphere of today? Regarding the experiments of Miller and Urey described in...

What was the composition of the earth’s atmosphere at the

time of the origin of life, and how did it differ from the

atmosphere of today?

Regarding the experiments of Miller and Urey described in this

chapter, explain what constituted the following in each case:

observations, hypothesis, deduction, prediction, data, control.

(The scientifi c method is described on pp. 11–14.)