D.
I believe is the answer
Hope this helps, sorry if not tho
<span>At first early human beings had to rely on hunting and gathering
in order to survive. During this period
they were able to identify some plants that can be edible. They were also able to learn how to use traps
to capture animals. Through their
hunting and gathering, they eventually learned how to plant and how to gather
animals and raise them in one spot. In
time, they were able to raise enough plants and animals for their needs that
some of these early humans can now settle in one area rather than roam the land
in search of food. Eventually these
small groups would grow in number and from a small family, you now have large
population living in one place and that is how towns began.</span>
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
