Answer:
Atoms. An atom is the smallest unit of a pure substance or element that can exist and still retain the properties of the original substance or element.
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Explanation:
Tinnitus
<u>B.</u><u> </u><u>carbonate shells are dissolved in deep water</u>
Carbonate sediments are rare in deep sea sediments because the <u>carbonate shells are dissolved in deep water</u><u>.</u>