Which is better for you: a drug that is a natural product or one that is synthetic?
A) Whether a drug is good for you does not depend upon whether the drug occurs naturally or was synthesized in the laboratory.
B) Synthetic products are generally better for you because they lack impurities that could bring on side-effects.
C) Drugs extracted from natural products are invariably better for you.
D) Drugs extracted from natural products are better except in the case where the synthetic drug is a replica of the drug found in nature.
A
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Ocean crust is denser than continental crust because ocean crust is ________
A) composed primarily of granite B) thicker than continental crust C) thinner than continental crust D) composed primarily of basalt
Sea floor spreading along the axis of an oceanic ridge results in symmetrical patterns of all of the following EXCEPT ______________.
a) the age of the sea floor b) the depth of the sea floor c) the paleomagnetic record d) the flow of heat through the crust e) the location of subduction zones
Which precipitation mechanism takes place when a warmer air mass rises after encountering a colder, denser air mass?
a. convectional precipitation b. frontal precipitation c. cyclonic (or convergence) precipitation d. orographic precipitation e. radiation precipitation
The velocity of seismic waves generally increases with depth in the earth
Indicate whether the statement is true or false