Answered

Which best explains why blood and the cytoplasm of cells are mainly composed of liquid water?

AWater is a common substance and is readily available.
BWater is an important transport and reaction medium.
CWater prevents biological reactions from occurring readily.
DWater prevents turgor pressure from making the cells too rigid.

Verified Answer :

Lakilister

The answer is not D, because water creates turgidity.
The answer is not C, because water is important in many biological reactions.
The answer is either A, or B. Knowing that water composes almost 75% of the body, you can assume that It is a common substance, for A, or you could know that is allows reactions to occur more easily, acting as a sort of catalyst, for answer B. 
A or B. Your call for the final answer.

The correct answer is B

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