True.
Every environment and ecosystem will include these factors.
It is D because nitrate reacts with the calcium and since na has a 2+ charge and no3 has a - charge we need 2 no3 to balance out the charge hence a 2 is placed outside the no3 bracket.
44 neutrons and 35 protons. The number of neutrons you have is equal to the atomic mass minus the atomic number.
8/5lit.. of 12M NaOH
2/5lit.. of 2M NaOH