Comparing the of an object with with that of a liquid will tell you weather or not the object will float in that liquid

Density

Explanation: When evaluating whether an object will float in a liquid, in this case water, we must measure the density of that object. Water, for example, has a density of 1 g/ml. This means that objects with a density of less that 1 g/ml will float. This can be applied broadly to many types of substances.

that scientist would be robert hooke

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;