Answer:
respiratory system: helps you to keep breathing
circulatory system: helps keep the blood flowing
skeletal system: your bones that keep your body looking like jello
muscular system: helps you stay in shape, and is much heavier than fat
digestive system: your body digesting food to get nutrients
Explanation:
respiratory system: your lungs
circulatory system: an organ system that gets blood to help get nutrients, oxygen, carbon dioxide, and other things
Skeletal system: basically your bones. they help you get up and stay up off the ground. you can't get up the mountain without your bones.
Muscular system: your muscular system is everywhere in your body. you use muscles to pick up your food and even use them to get off the couch.
digestive system: you will be digesting food or water on your climb, and you will need the digestive system to do this so you get the power to go higher
