A. it typically occurs 14 days before your next period. Therefore is is the closest answer.
Explanation:
oxygen has 8 protons and 8 electrons. In order to get the number of neutrons you take the atomic weight in this case 15.9999~16 and you subtract it by the number of protons (16-8).
(C)theories can be used to predict the existence of as of yet unobserved things or phenomena
Indigestion fiber, enteric bacteria, water
They have a cell wall and nucleus but they have no membrane-bound organelles like eukaryotic cells
