Final answer:
False. All people do not have the same proportion of slow-twitch to fast-twitch muscle fibers.
Step-by-step explanation:
False. All people do not have the same proportion of slow-twitch to fast-twitch muscle fibers. Slow-twitch muscle fibers are responsible for endurance activities and have a slow contraction time. Fast-twitch muscle fibers are used for quick, powerful movements and have a fast contraction time. Individuals can have different proportions of these muscle fibers depending on factors such as genetics, training, and physical activity.