Which of the following is true? A. Plant cells are unaffected when is scarce.

B. All organisms obtain water through food.

C. Water is important to some organisms.

D. Some substances must be dissolved in water before they can be used.

Option C, & D are true

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

it's c. elements are placed in rows based on how may valencies electrons have.