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.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects