Earth’s early atmosphere contained high concentrations of ____

a. oxygen and nitrogen
b. carbon dioxide and oxygen
c. oxygen and methane
d. oxygen and ammonia
e. carbon dioxide and nitrogen


e

Environmental & Atmospheric Sciences

You might also like to view...

Which of the following is an example of biomass?

A. crude oil B. solar energy C. synfuels D. petroleum E. agricultural waste

Environmental & Atmospheric Sciences

The development that set the stage for the evolution of animals that lived entirely on the land was the ____________________

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Water of a lower density usually lies below water of a greater density.

Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences

Removal of ________ will always result in the greatest changes in an ecological system.

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences