Please help me dudes

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

What is the subscript for oxygen in its molecular formula