Which of the following correctly describes a gas a) the particles do not move b) the particles are closely locked in position and can only vibrate c) the particles are free to move independently colliding frequently d) the particles are closely packed but have enough energy to slide past one another

c.)particles are free to move independently colliding frequently

This is because in a gas the particles are not packed and do move.So a b and d would be wrong.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

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