Question

fix the one word that is used incorrectly.

in the human body, the pulmonary vain carries oxygen - rich blood from the lungs to the heart.

Explanation:

The word "vain" is incorrect. The correct term is "vein". A vein is a blood vessel that carries blood. In the context of the pulmonary system, the pulmonary vein specifically carries oxygen - rich blood from the lungs to the heart.

Answer:

Change "vain" to "vein".