Question

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

Answer 1

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.

Answer 2

the skeletal system is not a organ system