Medullary Sheath

A layer of myelin encasing (and insulating) the axons of medullated nerve fibers...

Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..

Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

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