Q: You are presented with the quiz "What aspect is different for Bird and fish hearts" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fish have a circulatory system with a two-chambered heart" and "birds also have four-chambered hearts". So, what's the best answer to the question?

Choose your answer from: * circulatory systems. * matter vibrating. * tissue. * it keeps an organism warm. * members of their own species. * heat produced. * blood. * type of organs.
The answer is:
circulatory systems