Why is water vital to maintaining a constant internal environment?
a. it is cohesive
b. it is adhesive
c. it is a good solvent
d. it has a high specific heat

It is a good solvent.

Explanation:

Water plays an important role in the physiological processes of our body. The human body has 60%-65% of water. It is present in different cells of the body and maintains the osmosis. Osmosis is the water balance which is maintained by antidiuretic hormone/ ADH. This hormone releases from the pituitary gland. When there is less water content in the body, the secretion of ADH is more. This helps in reabsorption of water in the nephrons and checks less water content. When the water is excess in the body, the ADH will release in less amount and helps in excretion of more water by the kidney. Thus a water balance can be kept in the body.  

Water also helps in maintaining constant body temperature. When the body gets heated, it starts sweating and the evaporation of sweats cools down the body.  

Water is necessary for various cellular reactions and expels out the toxic materials from the body. In this way, water maintains a constant internal environment.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.