The blood also transports carbon dioxide, which is the waste product of this energy production process, back to the lungs from which it is exhaled into the air.
(The blood; transports back; carbon dioxide, which is the waste product of this energy production process) (carbon dioxide; is; the waste product of this energy production process) (it; is exhaled; into the air)
The blood carbon dioxide it
transports back is is exhaled
carbon dioxide, which is the waste product of this energy production process
the waste product of this energy production process
into the air