What important role does water play for living organisms

For some it provides habitat. It also provides a source of water and for animals that eat fish or water organisms then it provides food.

it's  the important biological molecules only the non-polar lipids (fats and oils) and large polymers.

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.