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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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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..

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Biological Viruses

Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

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Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

Digestion and Absorption of Food
Digestion and Absorption of Food

The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..