Why are slow-twitch muscles more beneficial than fast-twitch muscles for cardiorespiratory fitness?
a.
slow-twitch muscles are longer and thicker than fast-twitch muscles.
b.
slow-twitch muscles need less blood to contract than fast-twitch muscles.
c.
slow-twitch muscles need more recovery time between exercise sessions than fast-twitch muscles.
d.
slow-twitch muscles are able to use oxygen more efficiently than fast-twitch muscles.

select the best answer from the choices provided.

a
b
c
d