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the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from an electrically insulating substance called myelin and helps to increase the speed by which nerve impulses travel along the nerve.
the development of a distinct head, with a concentration of nervous tissue and sense receptors...
the area that occurs between the high water and low water marks. It is exposed to the air at low...
the excessive growth of algae in eutrophic streams, rivers and dams.