Please help Which organ is not connected to its system?

a) Spinal cord – Nervous system

b) Large intestine – Digestive System

c) Testes – Reproductive system

d) Kidney – Circulatory system

The answer is hilum.

Iagree the cover letter is most important it tells someone what you intend on doing

Answer; ovulation is the release of eggs from the ovaries, in humans this event occurs when the follicles rupture and release the secondary oocyte ovarian cells, after ovulation during the luteal phase, the egg will be available to be fertilized by sperm, the uterine lining (endometrium) is thickened to be able to receive a fertilized egg, if no conception occurs, then the uterine lining as well as blood will be shed during (menstruation);