The excretory system rids the body of toxic chemicals, excess water, salts, and carbon dioxide while maintaining osmotic and ph balance. which three organ systems combine to form the excretory system?

a. digestive system, muscular system, respiratory system

b. integumentary system, respiratory system, urinary system

c. circulatory system, endocrine system, integumentary system

d. circulatory system, digestive system, urinary system