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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Balanced Diet
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Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

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..

IQ, Creativity and Learning
IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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Plant Meristems and Growth

In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

Human gastrointestinal tract
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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..