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Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..

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A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

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Birth Control and Contraception

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

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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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Independent Assortment and Crossing Over

This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

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The Origins of Life

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