They can also slow their metabolism and heart rate during dives to conserve energy and air, and their lungs and blood vessels are especially efficient in absorbing oxygen.
(They; can slow; their metabolism and heart rate; T:during dives; to conserve energy and air) (their lungs and blood vessels; are; especially efficient in absorbing oxygen)
They their lungs and blood vessels
can slow are
their metabolism and heart rate T:during dives to conserve energy and air
especially efficient in absorbing oxygen