Looking at an ocean, how do we know if the water is heavy or light?

The lighter liquid floats on the heavier liquid, which sinks to the bottom. Water's density varies with temperature; when heated it will expand and therefore increase in volume. This means its mass per volume will decrease and it becomes less dense. Warm water, thus, is generally less dense than cold water.

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his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

i think that the best answer would be c.

tell me if im wrong : )