is a solvent for polar molecules and the most common solvent used by living things; all the ions and proteins in a cell are dissolved in within the cell. The missing words are a. water and cytoplasm
b. water and water
c. detergent and water
d. fat and water

The correct answer is - a. water and water.

Explanation:

Water is the universal solvent as it is the most common solvent for almost most of the substances. Water mlecules are able to dissolve polar molecules that have partial positive and negative charge are readily dissolve in the water.

In the cell all ions and proteins are dissolve in the water which makes maximum part of the cytoplasm and acts as the solvent in the cytoplsm within the cell of an organism.

it's c. (to reduce the greenhouse effect/carbon gasses)