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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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Neural Control Mechanisms

Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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Developmental Biology

Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..

Pikas are an indicator species for climate change
Indicator Species and Endangered Species

Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

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Stems

Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..