Question

The composition of a pure substance can not be altered by any( ) means​

Answer 1

$\Huge{\textbf{\textsf{{\color{Magenta}{⛄A}}{\red{N}}{\purple{S}}{\pink{W}{\blue{E}}{\green}}{R}}{\orange}{\purple{⛄}}{\color{pink}{:}}}}$

All pure substances sontain particle of only one kind having definite set properties and their composition cannot be altered by any physical means so we can say that all pure substances are homogenous in nature.