I believe that the answer is Urea.
Answer:
magnets are used in refrigerator to keep the door closed.
it is used in tv and computer screen.
magnets are also used in electrical bell.All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.Magnets are important because of their properties A particle moving in a magnetic field feels a force proportional to his speed, and to the field, so you can use a magnet that produce a field in a certain way and shape, in order to catch a particle in motion.
i hope this is a clear answer i answered the first question in 10 lines
hope it helps :)
Answer: What are the "following" questions?
wish I could've helped :) , so please be more deatiled/clear.
Answer:
Making farm land (agriculture), terraforming (so we can build homes etc.)
