Answer:
Contour refers to the sequence of motions between notes of a melody. In other words, contour is a measurement of how a melody moves between individual notes. All melodies have contour and it's one of the properties that's most useful for identifying and cataloguing melodies.
Explanation:
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Tetravalent
We have already seen an example of how a covalent bond can form between two hydrogen atoms producing molecular (H2) as opposed to the atomic form of hydrogen. ... As in all its compounds and its elemental forms, carbon is tetravalent, which means that it always forms four bonds.
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