Which statement describes what the density of an object represents. density is the amount of matter in a certain volume

The correct answer would be "Density is the amount of matter in a certain volume"

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

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above