The process is called respiration. There are two types of respiration aerobic and anaerobic. The one which uses oxygen is aerobic respiration.
Models show how the atoms in a compound are connected.
I believe the answer you are looking for is perception.

If the separation between the charges is increased then the magnitude of the force will increase in fact how the distance is being used in that formula.
The instantenous velocity is just the slope of the graph at a certain instant. Since the graph is a straight line, its instantenous velocity is uniform through out. v = dx / dt = (40 - 10) / (50 - 0) = 0.6 m/s.
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