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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.
three pairs of exocrine glands which secrete saliva into the mouth.
a fine thread-like structure. In plants: the stalk of the male sexual organ.
a type of nuclear division during which reproductive cells divide to produce gametes. The...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....