Adrenergic messengers belong to which class of compounds?
A) amides
B) amines
C) amino acids
D) polypeptides
B
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Much of the increasing global need for electricity can be met by solar sources because
A) about 70% of electrical demand occurs when the sun is shining. B) modern battery technology now makes electrical storage cheap and efficient. C) only about one square meter of photovoltaic cells are needed to heat a home. D) even at night most solar power systems run at about 50% of normal capacity.
Lenticular clouds form on the ____________________ side of mountains
Fill in the blank with correct word.
What is a limitation of an altimeter that pilots must account for?
A) Its readings may be too low or too high if the temperature varies from the expected. B) Corrections are not as accurate at low levels as they are at higher levels. C) They can't ever be used to determine altitude — only pressure. D) It has a low battery life at high altitudes.
Why would construction businesses find eskers to be economically important?
A) They provide flat areas for transportation routes. B) They provide nutrient-rich farmland. C) They provide easy access to water sources. D) They provide easily accessible sand and gravel deposits.