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Sagot :

Answer: the smallest particle of an element is called an atom.

Compounds can be broken down to simpler substance through the process called Chemical Reaction, I think.

In the universe, _______ makes up 75% of all matter, _______ makes up   abut 20% and ________ being the 3rd (5%) most abundant element.

Answer is

In the universe (hydrogen) makes up 75%

and (Helium) makes up about 20%

and (oxygen) being the 3rd makes up (5%)

Step-by-step explanation: Hope this helped :)