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There's no theoretical minimum to size, except that you need to have more than a single molecule to call it a "rock". The smallest bits would thus be on the order of nanometers.
what do you call the smallest partical that makes up all things
heart muscle
Your conscience!
The smallest part of a compound is the atom.
2.34mm
muscle tone
inner layer? well, i guess you could call the organs and the organ tissue as the inner layer.
"internal" or "inner"
appatermidis
The palm.
dermis-inner layerepidermis-outer layer