formed of molecules vs formed from molecules

[Duc]

A problem with preposition , I'm so embarrassed to read this sentence:
"No matter how complex,all matter is formed of molecules"
I wonder why they don't use ''FROM'' or "BY" before FORMED.Please help me!
Thanks in advance!
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Don't see your shade think you are great

[Jamie (K)]

You can also use "from" or "by", and it makes no real difference in the meaning.

[Nessie]

By the way, what does duc's original sentence mean? How can molicules be made into matters? => I don't understand!!! :O
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... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Duc]

I don't know too ,it is a sentence in my book
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Don't see your shade think you are great

[Yankee]

Hi duc

First of all, I'd like to mention that your last sentence should be worded this way:
"I don't know either."

The word matter is used in two different ways in your sentence. I suppose the author of your sentence was trying to be clever or tricky.

The second usage of matter in your sentence is definition 1 here:
"physical substance or material in general"
.