Agood model of the cell membrane would be?

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

Depending on the organism the number of in a cell may change