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Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

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Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..

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

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Fruits, Flowers, and Seeds

This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..

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Cell Biology

The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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The Gene Pool and Population Genetics

According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..