A confound is a(n) __ that is covarying with the independent variable

In recent research, Rosenzweig found that a stimulating environment results in larger neurons with more synaptic connections ______

a. only in infant rats b. only in adolescent rats c. only in mature rats d. in rats of any age

Children as young as _____ years old know that mental objects are different from real objects

A) 2 B) 3 C) 4 D) 5