You should always do A. form a hypothesis before performing an experiment also the other options cannot happen until after an experiment.
Answer : Any natural sources of CFC's are not known only the major sources like aerosols, propellants, refrigerants,etc are known. So, if any natural sources are given then it cannot be called as a major source for emitting CFC into environment.
Hello!
I believe the correct answer to this question is H+ and H2O.
I hope you found this helpful! :)
1 Gallon = 3.7854118 Liters
Answer:
The energy of an electron in many–electron atom is determined by both principal quantum number (n) and azimuthal quantum number (l)
