Which of the following is NOT a group of organ systems?

skeletal system, muscular system, nervous system

endocrine system, digestive system, nourishing system

integumentary system, excretory system, circulatory system

respiratory system, immune system, reproductive system

Verified Answer :

the skeletal system is not a organ system


Captin

A, the skeletal system is not a group of organs. 

the skeletal system is the Skeletal system, not a Respiratory system, or a Endocrine system , and it also does not have any organs involved with it.