The answer is: D. Biological precipitation.
Biological precipitation is the deposition of minerals from solution by the agency of organisms
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Deposition is the geological process in which sediments, soil and rocks are added to a landform or land mass.
Ocean sediments originate from numerous sources:
1) biological activity (biogenous).
2) weathering and erosion of the continents (terrigenous/lithogenous).
3) volcanic eruptions (volcanogenous).
4) chemical processes (hydrogenous).
Calcium carbonate (CaCO₃) is made of calcium, carbon and oxygen atoms.
Answer:
u need to see element table
<span> The </span>average atomic mass of an element<span> is the sum of the </span>masses<span> of its isotopes, each multiplied by its natural abundance</span>
2CF4 + 2Br2 ——> 2CBr4 + 4F2