In some sports, muscular strength can be more important than muscular endurance.

Explanation:

This statement is completely true. Sports are pretty diverse, there are some sports that need more muscular endurance and other that needs muscular strength. A great example to show this is weightlifting, which is an olympic sports based on which athlete is able to lift more weight, that's it, and to perform well you have to have muscular strength, not endurance, because each presentation doesn't last too much time, only couple minutes.

On the contrary, olympic cycling is a sports that demands endurance over strength, because it last a lot more time than weightlifting.

Therefore, the answer is true.

answer(b) keep oxygenated and deoxygenated blood separate;