Given the question: You are presented with the question "have a circulatory system with one or two hearts" and the following answer choices: - Birds - alpacas - elms - Clams - salmon - animals - toads - complex Now knowing that mollusks have a circulatory system with one or two hearts that pump blood and clams, oysters and snails are familiar mollusks, choose the best answer.
The answer is:
Clams