Shannon is in the 4th grade. When the 11:30 bell rings, Shannon and her classmates will get up from their seats and go to the lunchroom. For Shannon and her classmates, the bell is a __________

Which of the following occurs during the embryonic period associated with pregnancy?

a. The fetus assumes the fetal position. b. The mother's heartbeat quickens. c. The placenta is formed. d. The fetus begins to suck and swallow.

The results of research on genetic and environmental factors involved in alcohol abuse find that ____

a. genetic factors accounted for 56 percent of the risk of alcohol dependence b. genetic factors accounted for 75 percent of the risk of alcohol abuse c. genetic factors accounted for 55 percent of the risk of alcohol dependence while shared early environment made an 11 percent contribution to risk d. genetic factors made no significant contribution to risk of alcohol dependence while early environment made accounted for 56 percent of the risk of alcohol dependence