Identify the four most common vision problems of old age

If two variables covary, then _____

a. a change in one variable is not accompanied by a consistent change in the other variable b. as one variable increases, the other must decrease c. a change in one variable is accompanied by a consistent change in the other variable d. the two variables have the same mean

The most serious criticism against children's video games is that they

a. undermine the U.S. "war on terrorism.". b. instigate aggression through their violent action. c. seclude the child in solitary isolation, without peers. d. rob the child of innocent, age-appropriate play.