Question

Marathon runners:

A. are always very thin.
B. only eat carbohydrates.
C. tend to have more slow-twitch muscle fibers,
D. can run only one or two marathons a year.

Answer 1

C.tend to have more slow twitch-muscle fibers

Step-by-step explanation:

muscle fibers are focused on smaller movements, posture control, and fatigue resistance all of witch contribute to marathon runners.

Answer 2

c

Step-by-step explanation:

marathon runners tend to have more slow-twitch muscle fibers, while sprinters will have more fast-twitch muscle fibers which allow faster movment but does not last as long while marathon runners have more paced and can last a long time.