have a circulatory system with one or two hearts
Birds alpacas elms Clams salmon animals toads complex
A B C D E F G H
Clams, oysters and snails are familiar mollusks.
Clams have a circulatory system with one or two hearts
have a circulatory system with one or two hearts (A) Birds (B) alpacas (C) elms (D) Clams (E) salmon (F) animals (G) toads (H) complex