Mammal? Is this for science or?
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.
I’m pretty sure it is biological because it’s your biology transporting into the other persons
The answer to that is, Chlorine
Enzymes are meant to break down food in the mouth making it easier to consume and the food and gather the nutrients inside
