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With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

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

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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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Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..