The primary functions of the circulatory system in animals include:
a) To transport nutrients and oxygen: The circulatory system is responsible for distributing oxygen from the lungs and nutrients from the digestive system to cells throughout the body.
c) To remove waste products: The circulatory system also helps remove waste products, such as carbon dioxide and metabolic waste, from the cells and transports them to the organs responsible for excretion, like the lungs and kidneys.
Therefore, the correct answers are a and c.
The functions b) (to provide support) and d) (to break down food) are not primary functions of the circulatory system. Support is typically provided by the skeletal system, and food breakdown occurs in the digestive system.
1 answer