The ductus arteriousus is a blood vessel that connects the pulmonary artery to the descending aorta. Otherwise known as the ductus Botalli, this structure pumps blood into the fetus' non-functioning lungs from the right ventricle. This blood vessel will close at birth and becomes the ligamentum arteriousum.
A is the correct answer i know this one i had this question before
atom, molecule, cells, tissues, organ, organ system, organism
A sea sponge is what mimics a synthetic sponge
