Which of the following has changed the most since the 1970s?
a. the rate of births of twins and other multiples
b. the rate of preterm births
c. the average age of first-time fathers
d. the rate of singleton births
A
Psychology
a. the rate of births of twins and other multiples
b. the rate of preterm births
c. the average age of first-time fathers
d. the rate of singleton births
A