According to the principle of natural selection, genetic variations become more common over time if they are adaptive in a particular environment

Pastel colors, like beige and mauve, have intermediate amounts of

a. hue. b. saturation. c. brightness. d. color.

In describing the titles of journal articles, the author notes that many titles contain the phrase, "The effects of . . . ." If a title does not suggest a cause-effect connection, what might be a better phrase to use in the title?

a. "The relationship between . . ." b. "The role of . . ." c. both a and b d. neither a nor b