One who specializes in the treatment of infants is a
a. psychiatrist.
b. dermatologist.
c. gynecologist.
d. pediatrician.

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system

Types of scientific inquiry that biologist engage in that cannot be completely controlled

Approximately what portion of the foods that we eat have been genetically modified in some way? a.fewer than 10% b.about 50% c.nearly 100%