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Oceanographers can measure the salinity of a body of water in several ways, but the two most common methods are using a hydrometer set or a salinometer.

A hydrometer set consists of a cylinder, a hydrometer, a thermometer, and a temperature-salinity-density or TSD graph.

Explanation:

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B

because measuring the density of the water

the higher the current the higher the mag field around it the higher the influence on the compass

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.