Me how do lenses correct vision? by changing the index of reflection by changing the index of refraction by magnifying everything by making your retina bigger

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