What is needed to produce vitamin D?
A. Melanin
B. Sebum
C. Ultraviolet light
D. Calcium
Answer: C
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The molecular formula of chlorine gas is Cl2. One molecule of this gas would be attracted to another by
A. polar covalent bonds.?B. van der Waals forces.?C. ionic bonds.?D. hydrogen bonds.?E. intramolecular forces.
Secondary hypertension can be caused by ________
A) kidney disease B) stress C) smoking D) obesity
Why are sounds produced by adult men usually lower in pitch than those produced by women?
A. The larynx in more vertical in men B. The glottis is wider in men C. The vocal folds are thinner and shorter in men D. The vocal folds are thicker and longer in men E. Men have larger lung volumes than women
A sudden, loud noise will reflexively cause the tensor tympani muscle to __________ and cause the stapedius muscle to __________.
-relax; contract -contract; relax -contract; contract -relax; relax