Nanometer

Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

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

Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..

This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

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