Sometimes, a research hypothesis may be referred to as a(n) __________

Worldwide, _______ percent of babies are breast-fed at birth, while only ______ percent are exclusively breast-fed for the first six months

36; 36 90; 50 50; 50 90; 36

Stimulant drugs like caffeine, amphetamines, and cocaine are sometimes considered to increase energy output and are, therefore, called __________ drugs

A. androgenic B. pharmacokinetic C. ergogenic D. tachyphylaxis