8
QuizMultiple Choice

The Importance of Water

Question 8 • First Semester Biology

Which statement best explains why water is essential for all living things?

Answer
A
Water makes up 65% of human beings.
B
Water is an essential component of blood.
C
Water covers 75% of Earth’s surface.
D
Water is necessary for cellular functions.

Explanation

Water is necessary for cellular functions because cells rely on it for many chemical reactions and for moving substances around. This makes water essential to living things broadly. The other choices describe water’s amount in humans, its role in blood, or its coverage of Earth, but they do not explain its essential role in all living things.

AI-written and checked against the verified answer.

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