It would be the textbook glossary. A dictionary would be equally useful, but in a science class the teacher would want students to rely on the textbook glossary.
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The inference from the paragraph is about the consequences that can occur of we stop buying batteries.
<h3>What is an inference?</h3>
It should be noted that an inference means the conclusion that can be deduced from the information given in the story.
In this case, the role of paragraph 7 is about the consequences that can occur of we stop buying batteries. The author illustrated that the people who make it will stop if people stop buying them.
Learn more about inference on:
brainly.com/question/25280941
francesa uses oil paints, but martion prefers watercolors