Biological structures like DNA, proteins and cells all depend on molecules. ... Neurotransmitters like epinephrine are pretty simple molecules, but without them our nervous system couldn't work. Oxygen, containing just two oxygen atoms, is a very simple molecule, and it is certainly essential to living things.
5. Mitochondria and u didn’t finish writing number 6 sorry also can u plz help me on my questions too!
Ore is the answer as is contains large amounts of useful elements
