HELP

When Dr. Jeff jumps on a skateboard and uses the fire extinguisher to move, which of these does he change to move BACK to where he started?

direction of force

skateboard wheels

amount of force

type of force

i tried the eyeshadow trick you told me about and it worked so good i i did a yellow going into orange colors and it was bright and you could see it on my eyes

i thinking chemical change

a physical change is being made.

the answer is sex-linked recessive.