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

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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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Meiosis – The Genetics of Reproduction

Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..

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The Human Nervous System

The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

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The Water Cycle

The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

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