In the Scandinavian countries of Northern Europe such as Denmark, Netherlands, and Sweden, about ____ of older adults lived with a child

In a two-choice situation for pigeons, the left key has a VI schedule that delivers 60 reinforcers per hour, and the right key has a VI schedule that delivers 20 reinforcers per hour. The matching law predicts that a pigeon will make _______ of its responses on the left key.

A) 25% B) 50% C) 75% D) 100%

After ejaculation, a male rat will refrain from further copulation for a period of time. This is known as

a. the refractory period. b. sexual satiety. c. sexual inhibition. d. the Coolidge effect. e. the cold-shower effect.