Vinegar is insoluble in vegatable oil. Does this mean that vinegar is a totally insoluble substance?

No

Explanation:

This does not mean that vinegar is insoluble totally. In fact, vinegar is soluble in water because water is a polar solvent.

For a substance to be soluble in another, it must obey the rule of solubility.

The rule states that "like dissolves like"

It implies that polar solvent will only dissolve polar solute.

Also, non-polar solvent will only dissolve non-polar solute.

Therefore, the answer is no, vinegar will dissolve in water.

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

the answer would be c