At the beginning of its journey from the testis, a sperm cell is transmitted through an elaborate system of ducts by the continuous movement of:

Low socioeconomic-status adults age faster and die at a younger age than their wealthier counterparts. This is true:

A) only in affluent nations. B) only in developing nations. C) in every nation. D) only in nations without universal health care.

According to the article Sound familiar about the ability of newborns to remember speech sounds, in an experiment, an unexpected but reasonable explanation for the DV other than the IV is called a(n):

(a) errant variable (b) control group (c) hypothesis (d) confound