Answer:
They tell what each section is mostly about
Explanation:
For example if you were writing a paragraph about how your dog looks you're header might be something like "About My Dog" or something to that effect. Sorry I'm not very good at explanation but I hope this helped you. :)
D. is the answer hope this helps
Answer: It can affect brain development, leading to learning and behavior problems.
Explanation:
To be safety that s the most important things close
