MRI studies of persons using inhalants have revealed that the drug causes changes in brain structure that include __________

A) shrinkage of the cerebral cortex
B) lesions in the frontal lobe
C) a swelling of the cerebral cortex
D) abnormal growth of the myelin sheath around nerve cells.

Answer: A

Psychology

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A genotype

a) is the genetic makeup of an individual. b) is an individual's observable appearance, which represents the interaction of genes and environment. c) changes drastically throughout the life span. d) of one person is identical to the genotype of all of that person's siblings.

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Human development begins when a sperm penetrates the membrane of:

an ovum. the ovary. the placenta. an amino acid.

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