9) Which must be a mixture of substances?

A) solid
B) liquid
C) gas
D) solution

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

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Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.