A proton and an electron have and charge

In which of the following is positive work done by a person on a suitcase

Select the correct answer. what does the process of natural selection involve?

Consider an ideal gas at 27.0 degrees celsius and 1.00 atmosphere pressure. imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube. what is the length l of an edge of each small cube if adjacent cubes touch but don't overlap?