The density of the dinosaur, that is, it's mass divided by its volume, should be about the same as that of water, since living tissue is mostly water by volume.
(mass; divided; by its volume) (living tissue; is mostly; water) (The density of the dinosaur; should be; about the same as that of water; since living tissue is mostly water by volume)
mass living tissue The density of the dinosaur
divided is mostly should be
by its volume
water
about the same as that of water since living tissue is mostly water by volume