The answer is that <span>all
veins carry blood back to the heart, except for the pulmonary vein. the
vena cava empty into the right side of the heart, so they technically
bring blood to the
</span>main atrium.
Is there any optional answers?
The correct answer is that when a species is made up of different smaller groups, each of those smaller groups is known as a variety.
D. is the answer because soil and rocks are not living things
