i believe it is B, by process of elimination it cannot be C or A due to it not talking about cells or dissolving food
Answer:
B
Explanation:
The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.
Organ system is the answer
Tadpoles use GILLS to obtain oxygen
