Medullary Sheath

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

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

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

Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..

This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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