Answer: The liver.. :
Your liver is your body's largest solid organ. On average, it weighs around 3 pounds in adulthood and is roughly the size of a football. This organ is vital to the body's metabolic functions and immune system. Without a functioning liver, a person cannot survive.
Explanation: Pretty cool if you ask me.
Answer:
Soccer
Explanation:
Cleats are used for soccer and I don't think the rest need cleats.
Sign language. It uses only signs made with your hands. You do not have to hear to understand it.