Animals can be divided into groups or 'classified' by looking at the similarities and differences between them. Animals are divided into two main groups. Animals that have a backbone are called ...

This animal lays eggs, but it's not a lizard ... Here is a list of the classifications found in the modern hierarchy, their groups and characteristics from highest to lowest taxonomic rank.

Analogously, structural and sequence similarities are used for the classification of non-autonomous ... so far in eukaryotes belong to three classes characterized by the so-called cut-and-paste ...