According to the program, which animal has a higher percentage of slow-twitch muscle fibers?

The choice indicating that working draft horses have a higher percentage of slow-twitch muscle fibers is appropriate because slow-twitch fibers are particularly suited for endurance and sustained activities. Working draft horses are specifically bred and trained for tasks requiring prolonged exertion, such as plowing or pulling heavy loads over extended periods. These activities demand strong stamina and resilience over speed, making slow-twitch fibers, which are more fatigue-resistant, essential for their performance.

In contrast, running draft horses, race horses, and show horses often engage in activities that require explosive speed, agility, or short bursts of power. This may lead to a higher percentage of fast-twitch fibers in these horses, as these fibers are better for quick, high-intensity movements. Understanding the muscle fiber composition helps clarify why certain breeds excel in specific activities, highlighting the adaptation of working draft horses to their demanding roles.