An elderly professor of ichthyology (study of fish) once explained why he didn't like to learn his students' names by saying that every time he learned a new name, he forgot a fish. Which of the following best describes this phenomenon?

Adaora is 20 years old; her mother is 50 years old. All things being equal, Adaora should outperform her mother at:

a) tests of world knowledge. b) knowing historical facts. c) putting together puzzles quickly. d) solving crossword puzzles.

Which of the following groups of individuals would be most interesting to the research conducted by a behavioral geneticist?

a) people suffering from alcoholism b) parents and their children c) those suffering from cancer d) siblings who are identical twins