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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

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