The following symptoms are usually present in a specific disorder. What disorder?
weak muscle tone, feeding problems
slow development, intellectual impairment
food obsession, insatiable appetite, obesity
problems with temper and compulsive behaviors:

a) Childhood Obesity Syndrome

b) Prader Willi Syndrome

c) Beckwith Weidermann Syndrome

d) Angelman Syndrome

I'm soooo sorry but i can't answer but you can ask another professor

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

3. is true i think i should be right