Collaboration in science is important because if only one scientist does an experiment, and gets a result, he/she could have messed. So this is where collaboration comes in. A few other scientists could try the experiment, and if they get the same answers, the result may be proven correct.
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10 mph/s because there is 60 seconds in a minute then divide by 6 which is 10.
D. Volume will increase
Volume and temperature are directly proportional for a gas.