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Describes the nitrogen cycle.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Waste material in the oceans
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
How pollution creates dead zones in the ocean.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Hipervinculo Biología
Covers soil and water resources and the threats to these resources.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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