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
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What types of weather changes accompany the passage of a dryline?
What will be an ideal response?
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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
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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
The ________ forms the relatively cool, brittle tectonic plates
A) asthenosphere B) eosphere C) lithosphere D) astrosphere
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