What are atoms?what are elements?why do the microorganisms are known as boder of living and non living organism?

Atoms are the smallest bits of ordinary matter and are made from particles called protons, neutronsand electrons
i think u should ask one question at a time


Atoms are the smallest particle of the compound or element.
Element is a pure chemical substance that consist of single type of atom.
Microorganisms known as border of living and non living things because 
1. they are  helping in our survival.
2. they are the small living organisms that has cells.
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