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Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..

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

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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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Growth Patterns

This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..

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It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..