Please answer the following question: You are presented with the question "What aspect is different for Bird and fish hearts" and the following answer choices: - circulatory systems - matter vibrating - tissue - it keeps an organism warm - members of their own species - heat produced - blood - type of organs Now knowing that fish have a circulatory system with a two-chambered heart and birds also have four-chambered hearts, choose the best answer.
Answer:
circulatory systems