1. What are the main principles of the cell theory? Choose all that apply. All living things are made of cells. O All cells have a nucleus. O Cells are the basic units of life. Cells only come from other cells.​

you need to have a picture of the atom that way we can answer it

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.