How does rucking burn calories?

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

Which of the following is not of the top health concerns in the united states

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