It has been suggested that every 25 feet in a dive creates a cerebral impact equivalent to drinking one alcoholic beverage.

The signs and symptoms of stroke may closely resemble those of what other condition?

A) Narcotic overdose B) Syncope C) Stroke D) Hypoglycemia

Why is it not advisable to interchange one ocular lens with another from a different brand microscope?

a. The two ocular lenses in a microscope are optically matched with one another. b. The fitting for the ocular lenses varies, so they will not fit in another microscope. c. They cannot be removed from the microscope. d. They are fragile and are likely to break when removed from the microscope.