Which of the following best describe the main function of the cyrculatori system ? a. to deliver nutrients an other essential material to cells an remove waste products

b. to break down the nutrients found in food so that they can be used by all cells in the humand body

c. to produce the chemical signals that allow parts of the humand body to communicated over long distances

d. to coordinate all others humand body system so that they can function together to maintain homeostaisis