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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 body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

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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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Still Water Animals

Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

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