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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.
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
emitting (or giving off) radiation energy, which is harmful to living organisms.