Water's. makes it an excellent solvent for salts, like sodium chloride, as other substance required by cells to carry out metabolic process

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]