Why is it convenient to pull luggage bags fitted with rollers

because the smooth bottoms of the wheels prevent friction.

Explanation:

imagine wearing socks on a tile floor. You can slide, right? Now imagine doing the same thing without socks. You don't slide. That's friction. The wheels make it so that the suitcase can roll on the floor without friction.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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