A concept map on mammals are classified into three components. First is monotremes and other two are shown with numbers 1 and 2. Monotremes oval is further expanded to the oval with number 3. Oval with number 1 is expanded to the oval named as 'Kangaroos and opossums'. Oval with number 2 is expanded to the oval named as 'Most mammals'. Student needs to fill the ovals with numbers 1, 2, and 3 to complete the concept map.