Explanation

Order is the assemblage of families which exhibit a few similar characters. The similar characters are less in number as compared to different genera included in a family. For example, plant families like Convolvulaceae, Solanaceae, etc. are included in order-Polimoniales mainly based on floral character. In animals, order-Carnivora includes families like Felidae and Canidae Family has a group of related genera with less number of similarities as compared to genus and species. Cat and dog showing some similarities and some differences are placed into two different families-Felidae and Canidae, respectively.