What experimental apparatus has been used to study depth perception in infants?

In psychological experiments, the generally accepted rule is that the difference between groups is statistically significant if it would have happened by chance only of the time at most

a. 25 percent b. 50 percent c. 0 percent d. 5 percent

The discussion of the biology of pregnancy stated that

a. the egg and sperm unite while the egg is traveling down the fallopian tube. b. the uterine lining is sloughed off just after the fertilization of the egg has occurred. c. the fallopian tubes are responsible for increasing the production of progesterone and estrogen in a pregnant woman. d. the placenta develops during the first months after fertilization, but then it gradually diminishes in size toward the end of pregnancy.