Answer:
The correct answer would be b. circulatory system.
In animals, the circulatory system consists of heart and blood vessels. It primarily circulates oxygen and nutrients throughout the body and also helps in removing metabolic waste such as carbon dioxide from the body.
In plants, the circulatory system consists of xylem and phloem. Xylem helps in transporting water and minerals from roots to the leaves. Phloem helps in circulating food from leaves to other parts of the plants.
