Which main body system is responsible for breaking down food from energy? a: circulatory systemb: digestive systemc: muscular systemd: skeletal system

If you were running a marathon, which type of muscle fibers would be most useful to you? a. slow-twitch b. fast-twitch, type i a c. intermediate-twitch, type ii b d. slow-intermediate twitch, type i b select the best answer from the choices provided. a b c d