A hydrometer is an instrument that measures the specific gravity (relative density) of liquids. The ratio of the density of the liquid to the density of water. A hydrometer is usually made of glass, and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float
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Common insect adaptations include an exoskeleton (outer skeleton), camouflage, wings, the ability to have lots of babies, and adapted legs and mouthparts
Four single bonds, 2- two single and one double bond, 3- one single and one triple bond, 4- two double bonds.
