Infertility rates, according to the text, have remained constant over the past one hundred years at the rate of ___

According to the definition used by researchers, can adolescents attain expertise in a specific field? What if their area of expertise is video gaming? Could these adolescents be considered an exception?

What will be an ideal response?

Comparing the two types of concepts, logical is to as natural is to

a. negative; positive b. subordinate; superordinate c. superordinate; subordinate d. positive; negative e. clear; fuzzy