I would say a. Unintentional
The benefit of the circuit of fetal blood course through the ductus arteriosus is the ductus arteriosus will permit more blood to go to the placenta and sidestep the lungs (since there is no blood required there yet). I hope the answer will help you.
The term duration refers to C. how long a workout or exercise lasts.
Explanation:
The definition of duration is "the time during which something continues." C is the only answer having to do with the time the workout continues at.
