why does the human body need water to survive?

Your cells need water to reproduce and to help maintain homeostasis

Explanation:

It can save you from being dehydrated. For survival, you'll die for 21 days or more. Like many living things, you need water for the human body to stay alive and healthy. So again, your body uses water in all its cells, organs, and tissues to help regulate its temperature and maintain other bodily functions. Because your body loses water through breathing, sweating, and digestion, it's important to rehydrate by drinking fluids and eating foods that contain water.

it hurts at first because " the cherry is broken" which is a thin layer of skin that breaks so the first time girls have sex it hurts and it bleeds but after the first time it does hurt again because the skin that ia torn does not break again/ grow back.

i don't think so because different teachers have different materials. tehy teach differently, unless you know for sure your teacher is the exact same as others. i would just contact ur teacher