The usual, naturally-occurring mechanism that prevents development of cancer is the action of ____
a. cytotoxic T cells
b. oncogenes
c. radiation
d. chemotherapy
e. carcinogens
ANSWER: a
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A. endoderm: kidneys B. ectoderm: posterior pituitary gland C. mesoderm: circulatory system D. endoderm: liver E. ectoderm: nervous system
What percentage of the population are children 4 year old and younger in West Africa?
A. 8.5 B. 12 C. 17 D. 23 E. 50
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A) solid-colored female kittens. B) calico female kittens. C) solid-colored male kittens. D) calico male kittens. E) Any of these
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Indicate whether the statement is true or false