The substances that are necessary for producing of certain hormones and that store and transport vitamins

The consumption of fossil fuels could be

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?