When in-group preferences are accompanied by strong negative feelings about the out-group, children may develop feelings of

A key difficulty in explaining how language evolved is the _____ phonemes, words, and rules of syntax

A) consistency of B) arbitrariness of C) resemblance of meaning to D) rigidness and uniformity of

The idea that the eye contains three pairs of color receptors (red-green, yellow-blue, and black-white) is known as the ______ theory

a. opponent-process c. additive mixing b. trichromatic d. subtractive mixing