ca voi co quan he ho hang voi lop thu hon vica voi la dong vat co vu thuoc lop thu

theo mk thi;

cac loai ca neu tren deu co moi quan he ho hang voi nhau vi chung  tu mot nguon goc

 ca heo voi ca voi xanh co quan he gan nhat vi cung thuoc lop thu va chung tu mot nguon goc

than lan tru dong vi no la dong vat bien nhiet ko thich nghi vs moi truong ben ngoai

much

tho song o ven rung trong cac bui ram