Which type of leukocyte destroys tumor cells and cells infected with viruses?
A. T cells
B. B cells
C. Schwann cells
D. natural killer cells
Answer: D
Psychology
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Recent research has found that diseases that appear as we age may be a result of which of the following?
A) Genomic imprinting B) Polygenetic inheritance C) Genomic inheritance D) Polygenetic imprinting
Psychology
As explained by behavior systems theory, a dog approaches a light in a sign-tracking experiment because the light elicits the _____ component of the dog's feeding system
A) ?consummatory B) ?social C) ?predatory D) ?exploratory
Psychology