Every fragrance we smell in the air, is representative of millions of molecules, and every molecule is comprised of numerous atoms.
We have already established that we are all about bacteria, right? Fighting off the bad bacteria that causes odors at the microscopic level, correct?
The natural world can be divided in to the Macro (what we can see with our naked eyes) and the Micro (what happens behind the scenes). The first is almost entirely controlled by the second.