The immune system, and the excretory system
(Honestly, all of them work to keep us 'healthy', but I believe these are the ones you're looking for)
D. All of the above ( is the answer)
Wound healing the natural way the body heals or restores broken tissues due to injury. Wound healing consists of four phases: hemostasis, inflammation, proliferation and maturation. During the proliferation stage, epithelialization, fibroplasia and angiogenesis occur during this stage. This is the stage wherein the growth of new tissue occurs.