Last fall, a state college introduced a one-week study skills course for new freshmen students. At the end of the academic year, the college compared the grades and dropout rate for their freshmen with the corresponding measurements for freshmen at a neighboring state college. This study is an example of a ____

If a teratogen interferes with prenatal development only during a particular period of time, the period of development in which the teratogen can exert its effect is called:

a. a teratogenic period b. a teratogenic stage c. a critical period d. a high-risk – low-reward stage

When Izzy gets home from school, she hands her book report to her grandmother to show off the A that she got. She is surprised when her grandmother holds the report at arm's length to read it rather than holding it closer to her eyes. Izzy's grandmother seems to be suffering from a. cataract

b. presbycusis. c. presbyopia. d. glaucoma.