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Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

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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..

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Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

An artist depiction of a Precambrian multicellular life form.
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The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..

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This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

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A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..