Saturated fats are solid at room temperature, while unsaturated fats are liquid at room temperature. This is because saturated and unsaturated fats differ in their chemical structures. Saturated fats have no double bond between molecules, which means there are no gaps and the fat is saturated with hydrogen molecules.
A liver has to work 24 hours a day because the body cannot function
Farsightedness is your answer
voluntary movement, perception, homeostasis and cognition (abstract functions)