Worms with a Well- Developed Circulatory System (Including Five Pairs

Question

Worms with a well- developed circulatory system (including five pairs of hearts) are
A) annelids.
B) eels.
C) nematodes.
D) platyhelminths.
E) echinoderms.

Accepted Answer

Annelids, such as earthworms, have a well-developed circulatory system with multiple hearts, specifically five pairs of aortic arches that function like hearts.