Observation should come first. Check the other answers in case im mixing up a different method. False.
That would be C.
Diagram shows photosynthesis, where light energy is converted to stored chemical energy in the form of sucrose/glucose(carbohydrates).
Wdym? what can be treated?
Well there are over 125 billion Galaxies out there that are estimated of at this time. Each holds anywhere from 100 to 400 billion stars each. That is a lot of starts! Hope this helps. :)