How do water masses move in the ocean?

Explanation:

Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms. ... These currents move water masses through the deep ocean—taking nutrients, oxygen, and heat with them.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.