An observational study is also called a:

a. case series. c. randomized controlled study.
b. nonrandomized control trial. d. cohort study.

d

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The most common cause of throat infection is the Streptococcus bacteria, Group ________

a. A b. B c. C d. D

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The primary component of most urinary calculi is:

A) cystine. B) leucine. C) tyrosine. D) calcium.

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