Three chairs were rolling across a flat office floor. The blue and red chairs are the same mass, and they have more mass than the yellow chair. Each chair was
hit by another chair, but not from the same direction.

The correct answer is b

Control variable- changedependant variable- stays the samechanging- food itemsdependant- presences of proteins

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The one that would be the most effective means of controlling current water pollution of us surface water is : shutting down factories that discharge materials to the rivers.the largest sum of us pollution currently caused by factory-related substance