Answer: freezing and evaporation for sure
Explanation:
B) To remove inorganic material.
CH4 + O2 = CO2 + H2O - Chemical Equation Balancer.
The are isotopes because the atomic number (meaning a same number of protons) is the same but the atomic masses are different. this means they have a different number of neutrons which is what isotopes are.
answer is E- all of these