Biology Zoology How many hearts does a worm have? March 8, 2026 by Tanp | Leave a Comment A common earthworm possesses five pairs of aortic arches, often referred to as "hearts." These structures function similarly to hearts by pumping blood throughout the worm’s circulatory system. Understanding the Earthworm’s Unique Circulatory System When you think about how many hearts an animal has, you might picture a single, powerful organ. However, the earthworm presents […] Read more ยป