By selecting a representative sample and polling them, we can draw conclusions about the larger group called the population

People, such as pilots, who have to move quickly from lighted surroundings to night darkness use red light illumination. This is because

a. red light slows down dark adaptation. b. the rods are insensitive to red light. c. the cones are insensitive to red light. d. red light is a stimulating color and tends to keep pilots and military personnel aroused and alert.

Which test examines the embryo or fetus during the first 23 weeks of pregnancy by means of a fiber-optic device inserted through the cervix?

a) embryoscopy b) amniocentesis c) sonoembryology d) chorionic villus sampling (CVS)