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What are the variables in his hypothesis?

The independent variable is the number of dry cells, and the dependent variable is the length of time the bulb works.
The independent variable is the length of time the bulb works, and the dependent variable is the number of dry cells.
The independent variable is the number of dry cells, and the dependent variable is the amount of energy available.
The independent variable is the amount of energy available, and the dependent variable is the number of dry cells.

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Answer:

The independent variable is the number of dry cells, and the dependent variable is the length of time the bulb works. Initially, scientists described atoms as the smallest particles of matter. However, smaller particles within atoms were discovered.

Explanation:

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