When researchers study drug actions in rats in order to predict drug actions in humans they are using rats as?

They are using rats as animal models.

Explanation:

Rats are one of the most common animal models used in scientific experiments, from behavioral to biomedical studies. The principle that sustains this type of research is that animals share physiological and behavioral characteristics with humans. In the case of drug addiction studies, rats have been used to analyze drug consumption tendencies and effects.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

answer; (you have the right of way);