Answer:
I would personally recommend taking AP courses for any medical degree. Many colleges or universities consider AP and IB classes to be equal, and unless you are planning to go to college/university out of the US, Advanced Placement classes will be more accepted. Another reason why I would advise against IB classes is that it is not worth it to only take specific classes and is more beneficial to take the full diploma course. Some places will allow you to take individual classes instead of the full program like you would in AP, but it is not a guarantee. AP classes allow you to specialize more and avoid any classes you feel particularly weak in.
Yeah the answer is A btw just took the test
It covers a more understandable distance that can be determined by a more reasonable unit of measure.
The answer is high pressure. In a nuclear reaction process, high temperature and high pressure is required for turning hydrogen nuclei into a helium nucleus. It is impossible for it to happen simultaneously because it requires tremendous amounts of energy. Extreme conditions are required for the atoms to overcome electrostatic repulsion.