Explanation:
Option D is the correct option.
Based on the given conversation above between Ben and his parents, the testable question for the hurricane research of Ben is option C: "Is the number of hurricanes increasing each year?" This is the testable question since they are arguing about the number of hurricanes in the past summers. Hope this helps.
Answer:
Lymphatic system
Explanation:
The lymphatic system helps maintain fluid balance in the body by collecting excess fluid and particulate matter from tissues and depositing them in the bloodstream.
