Medullary Sheath

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

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

This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This less..

Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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

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