There is invariably a trade-off between ________ and ________ in social psychology experiments

The lens:

A) is the transparent outer membrane of the eye that covers the pupil and iris. B) allows one to focus on objects at different distances. C) allows light initially to enter the eye. D) controls the amount of light entering the eye.

_______ refers to a child's ability to select and gauge the effectiveness of different memory strategies

Fill in the blank(s) with correct word