Ocean currents are largely driven by the density of water, similar to the circulation of magma that occurs in earth's mantle. what will likely happen to a large mass of water that is significantly denser than the water surrounding it?

Denser water will sink and less dense water will flow and take it’s place.

Explanation:

format change of dna.  

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.