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Hello friends! Welcome to a new happy learning video. Today, we're going to get to know

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a system in our body which without, it would be impossible to live. Today, we're going

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to get to know the excretory system. The excretory system is made up of the urinary system, which

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produces and expels urine, and by the sweat glands, which produce sweat. The excretory

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system's most important mission is to expel waste substances from our bodies. Do you want

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to get to know the excretory system better? Do you want to know what functions each part

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has? Do you want to know why we sweat when we run? You do? Well then click on this link

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and you'll be able to watch the full excretory system video. I'm sure you'll get an excellent

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grade in your exam. Goodbye happy friends, see you in the next happy learning video!