The body absorbs nutrients through the small intestines. The blood transports these nutrients to every cell in the body. The blood also carries oxygen to every cell. The cells use the nutrients and oxygen to supply the energy the body needs. What three body systems are working together in this situation? *
A. nervous, digestive, and circulatory systems
B. digestive, circulatory, and excretory systems
C. circulatory, immune, and respiratory systems
D. respiratory, circulatory, and digestive systems