This question is misguided. A property is not a concrete thing so it is incorrect to speak of breaking it down. (It means something you can say about a substance or an object.) I suspect you mean what type of substance cannot be broken down any further, and the answer to that is an element. It is a property of an element that it cannot be broken down even by chemical changes.
No
No, it's not possible to discover something that does not exist because discovery implies finding or revealing something that is already there. If something does not exist, it cannot be discovered.
An element is the only substance that cannot be broken down.
An element cannot be broken down into a simpler substance by chemical means.
None.
A substance that cannot be broken down any further and stays the same substance would be an element
unbreakable
If it is in your blood already then you have the disease. You cannot re-infect yourself with something which is already there.
An element is a pure substance that cannot be broken down any further by chemical reactions. Each element is made up of atoms with the same number of protons in the nucleus. Examples of elements include oxygen, carbon, and gold.
You cannot preserve something that is already extinct!
Cannot be broken
Ghosts CANNOT be killed, you can't kill something that is already dead.
because it is like a rule of science that cannot be broken. it is impossible to be broken. there are theories which aren't proven yet but laws are proven already
No
You cannot fix it. It is broken and cannot be changed. You must get a new one or something.
No, it's not possible to discover something that does not exist because discovery implies finding or revealing something that is already there. If something does not exist, it cannot be discovered.
No. It is an element and fundamentally already as "broken down" as possible.