Which of the following animal respiratory pigments does not contain iron?

W) Hemoglobin [HEE-muh-glob-bin]

X) Hemoerythrin [bee-muh- ih-RITH-rin]

Y) Myoglobin [my-uh-GLOH-bin]

Z) Hemocyanin [bee-muh-SAHY-uh-neen]
Z) HEMOCYANIN