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OpenStudy (anonymous):

What is the defining feature of a system? A. properties that don’t change B. collision C. interaction D. gravitational force

OpenStudy (paki):

what you say...?

OpenStudy (paki):

i will go for "interaction" here

OpenStudy (jgirl128):

I think it's interaction too

OpenStudy (anonymous):

Yep its C ;D

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