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When we go to the countryside sometimes we can observe big amounts of garbage left there by humans. There is another kind of garbage, a natural kind; it is called biodegradable garbage. It consists on natural products that disappear or separate into their constituent parts and become nutrients for the plants. Some examples are the rests of animal furs, leaves, fruit peels... We have to learn not to throw or leave non-biodegradable products, because they are harmful for the environment. 
Let's make an experiment in order to distinguish what kinds of garbage are biodegradable and what kind aren't:
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