Sutemizuvchi hayvonlarni tegishli guruhlarga, tartib bilan evolyutsiyon taraqqiyot asosida joylashtiring.
I- yo’ldoshlilar; II- tuxum qo’yuvchilar; III- xaltalilar;
1- bo’ri; 2- tuyaqush; 3- kenguru; 4- suvsar; 5- echkiemar; 6- yirtqich tishli kaltakesak ; 7- exidna; 8- morj; 9- o’rdakburun; 10- koala; 11- krot; 12- yerqazar; 13- ko’k kit;

1. II- 6,7,9; III- 5,10; I- 1,4,8,11,12,13
2. II- 7,9; III- 3,10; I- 1,4,8,11,12,13
3. III- 4,11; II- 3,9; I- 1,2,4,5,7,11,12,13
4. I- 1,4,8,11,12,13; II- 7,9; III- 3,10