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the development of a distinct head, with a concentration of nervous tissue and sense receptors at one end, known as the anterior end of an animal.
the structural and functional unit of the kidney, which filters the blood and produces urine....
small solid particles of matter such as soot, ash, metal and dust.
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...