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When an athlete perspires after running

When an athlete perspires after running evaporation occurs and helps to cool the body.

Correct option is A.

When an athlete perspires after running then sweat evaporates and we know that evaporation causes cooling as evaporation requires heat energy. The required heat energy is taken away by the molecules of sweat when they convert from liquid into gas, and this causes cooling on the surface of body. That's why it helps to cool the body.

answer; ///i do believe that the correct answer is ; ///(physical change);

car a and b are moving in opposite directions

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