Why is the Water Cycle important?
All living things need water to stay alive.
The water cycle is the only natural way to refresh water, ensures a constant supply of fresh water for living things on the Earth.
Digestive system-water is needed to digest food, to absorb digested food and to pass out waste.
Respiratory system-Water is needed for gaseous exchange between the lungs and the air we inhale.
In lungs- air sacs called alveoli are surrounded by a thin layer of water.
Oxygen dissolves in this layer of water before entering the blood.
Carbon dioxide dissolves in this layer of water before it is released into the alveoli and exhaled.
In the circulatory system, water is needed in the blood to carry oxygen, digested food, nutrients, carbon dioxide and waste materials.
Body system need water to function properly => gives us signals(thirst) => we get thirsty.
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