We say that a single study proves a theory because those who are smart enough can get it done quickly, and we say that a single study disproves a theory because that means it makes them feel smart when we disprove someone very intelligent but also it's to make sure if nothing was done wrong
Atoms are the building block for one element whereas molecular are different element atoms bound together either covalently or ionically
Currents distribute heat because they take warm water from the equator to the north and colder places making the water warmer there
I'm assuming that you mean currents with water sorry if u aren't
