Good sleep hygiene, the behaviors that promote good sleep, will help ensure that middle schoolers get enough sleep.

How does the author develop the key concept in this sentence?
by giving example
by describing specific steps to solve a problem
by comparing ideas
by describing an important term

The author develops the key concept in this sentence by describing an important term, which is "good sleep hygiene."

In this sentence, the author develops the key concept of good sleep hygiene by describing specific behaviors that promote good sleep. This includes explaining that by following certain behaviors, middle schoolers can ensure that they get enough sleep. The author does not give an example or compare ideas, nor do they specifically describe an important term. Instead, they focus on providing specific steps to achieve the desired outcome of enough sleep for middle schoolers.

In this sentence, the author develops the key concept of good sleep hygiene by describing specific steps to solve the problem. The behaviors that promote good sleep are mentioned as the specific steps that will help ensure that middle schoolers get enough sleep.