a)It started in Canada.
b)It was started for hockey players since the summer sun melted the rivers and they couldnt practice.
c)Because they had smooth-turning precision wheels in a line down center.
d)You have more space to practice it,because you can do it on the street.
e)After practicing,they can reach 30 miles per hour.f)It consists of a helmet,knee and elbow pads and special wrist bands.
g)Nowadays,anyone can use them.
