Because the molecules that are being transported is moving against its concentration. gradient. in other words, its moving from where it's low in concentration to where it's high in concentration.
All living things are made up of cells.
1. Distance from the Earth to the Sun
2. Hurt your hand from the reaction force (Newton's 3rd law is every action has an equal and opposite reaction)
3. The Earth to rotate slightly slower (I think)
Hope this helps :)
No because if your body has never experienced it before it will not no what to do and most likely the body will just send out/produce the other common antibodies or cells