A general cohort would be assembled to study which of the following? Group of answer choices a. Use of oral contraceptives b. Medical procedures c. Unusual diets and lifestyles d. Health effects of rare exposures

Its d because a mechanical wave have a medium physical requirement 

Frog is rorangutan is krhino is kfly is rshark is kremember! "k"aring kangaroo, "r"apid rabbit. rabbits have lots of babies at once and focus on numbers rather than quality. kangaroos have one at a time and focus on quality rather that numbers. also, rabbits go into heat very often, kangaroos do not go into heat that often. (a little tip from my bio teacher mr. kelly)

True would be the correct answer