Which cells serve as electrical insulators in the central nervous system?
a. Schwann cells
b. oligodendrocytes
c. astrocytes
d. efferent neurons
e. afferent neurons
ANSWER: b
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What percentage of the world's tropical forests have been cut down for cropland, fuel wood, grazing
land and timber? a. 20% b. 30% c. 40% d. 50% e. 60%
A person who is homozygous for the gene for hemoglobin A will have sickle-cell disease
Indicate whether the statement is true or false
Neil is a football player. We can tell whether he is getting enough calories by all the following EXCEPT
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