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
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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
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