Turning a key to start an engine is an example of a unit of work activity known as a(n):

When a 9-month-old cries and fusses every time his mother leaves the room, he is showing

a. social referencing b. stranger anxiety c. separation protest d. insecure attachment

Which of the following phenomena is a function of the distribution of the rods and cones in the retina?

a) The moon looks much larger near the horizon than it looks when it is higher in the sky. b) The light from distant stars moving rapidly away from us is shifted toward the red end of the spectrum. c) Stars can be seen only with difficulty during the daytime. d) A dim star viewed at night may disappear when you look directly at it but reappear when you look to one side of it.