Nitrogen makes up 70-80% of the atmosphere. If nitrogen weren't here, we wouldn't be able to breathe in oxygen because of the density of the air and because the air would then be toxic and flammable because there would be too much oxygen in the air. So with nitrogen, we are able to breathe safely. It makes it so we can breathe and keeps the atmosphere at a normal density.
Hope this helps.
EDTA is a synthetic amino acid and is a chelating agent. They are are capable of forming bonds with heavy metals in order to form very complex structures wherein the body could dispose easily in through the urine. It is used in removing lead, mercury, iron, aluminum and many other metals.<span />
According to Newtons second law of motion:

This shows, acceleration and mass are inversely proportional. So, larger the mass, less will be the acceleration produced and vice versa.
In case of a sports car and a fully loaded truck, the mass of truck is a lot more than the sports car. As a result the sports car will accelerate faster when the traffic light turns green.