What is molecule what is atom what is chemistry

Explanation:

A molecule is a group of atoms bonded together representing the smallest fundamental unit of the chemical compund and that it can take part in a chemical reaction.

An atom is the smallest unit into which matter can be divided without the release of electrically charged particles. It is also a unit of matter that has a characteristic properties of the chemical element. The atom is the basic building block of chemistry.

Chemistry is the science that deals with the properties, composition, and structure of substances.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully