The oxygen in Earths atmosphere:
a. was manufactured inside stars.
b. was added to the atmosphere by plant life.
c. has grown more abundant since the origin of Earth.
d. all of these
e. none of these
d. all of these
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What is the main reservoir for Nitrogen?
a. Sedimentary rock b. Plants c. Soil bacteria d. Feces e. Atmosphere
The trade barrier that involves levying one tariff rate for a certain amount of an imported commodity and a higher tariff rate for quantities in excess of that amount is the
a. export subsidy. b. import subsidy. c. tariff quota. d. quality standards requirement.
Which of the following would be transcribed into mRNA?
A. a promoter B. a ribozyme C. a noncoding gene D. a protein-coding gene
Pentamidine is an example of an antimicrobial
A) used to treat bacterial infections. B) effective against helminths. C) used to treat viral infections. D) effective against eukaryotes, especially protozoa. E) used to treat both bacterial and fungal infections.