I think the answer you are looking for is that the stomach is the fourth level of organization.
Have a control. You have to have something to compare your experimental results or else your results could be random chance.
The object's mass. Weight would be how gravity affected it, size is how large it is, density is how tightly the molecules are to each other. Mass is how much matter is in the object.
Answer: They are also known as <u>B. tranquilizers</u>
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Hope this helps!
