Unit Test — Cumulative exam Answers

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23

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

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.
25

Which process could cause ice to form a thin layer over a lake?

A
freezing
B
sublimation
C
evaporating
D
condensation

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