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4) The forces exerted on the outside world by our limbs are much smaller than the forces exertedby the muscles in our bodies because: A- the mechanical advantage of our limbs is less than one B- the forces exerted by our muscles are counterbalanced by opposing muscles C- our muscles are inefficient D- we dont excersize enough 5) Some dinosaurs were bipedal (walked on two legs) If they had long necks, they also had long tails so that: A- their center of gravity would always be above their feet B- tails were used as weapons in the age of dinosaurs C- they could shed their tails as a defense mechanism D- they could use their tails to hold things