Which chemical comprises 78% of our atmosphere by mass and is contained in proteins, DNA, and RNA?

a. Carbon
b. Nitrogen
c. Water
d. Phosphorus


Answer: B

Environmental & Atmospheric Sciences

You might also like to view...

What types of weather changes accompany the passage of a dryline?

What will be an ideal response?

Environmental & Atmospheric Sciences

A vertical cross section of soil extending from the surface to the deepest extent of plant root activity or to the regolith and bedrock is known as a

A) soil horizon. B) soil profile. C) pedon. D) polypedon.

Environmental & Atmospheric Sciences

In which portion of a nephron is lost HCO3- replaced?

A) the distal tubule B) Henle's loop C) the glomerulus D) the proximal tubule

Environmental & Atmospheric Sciences

The ________ forms the relatively cool, brittle tectonic plates

A) asthenosphere B) eosphere C) lithosphere D) astrosphere

Environmental & Atmospheric Sciences