ive had this a few times as well so here is your answer
Hunger pangs, or hunger pains, are caused by strong contractions of the stomach when it's empty. ... They may be caused by an empty stomach and a need or hunger to eat, or they may be caused by your body being in a routine of eating certain amounts of food or eating at specific times of day.Oct 23, 2017
Where are the answer choices?
It is true that drugs need to go through a series of research studies and trials to ensure safety and efficacy.
Answer:
To learn more.
Explanation:
Scientists want to know the advantages and downsides of it, like any other invention. To see if it can replace something else and be safer.