Classification. Essential Question. How are animals classified? Vocabulary to know: Classification Vertebrate Invertebrate. Classification?. Animals are separated into groups or categories so that they are more easily studied and discussed by scientists and others. Two Main Animal Groups.
Vocabulary to know:
They are animals that have backbones, such as a tiger or you! They can be as different as frogs and elephants. This large group of animals is divided into five smaller groups. Vertebrates tend to be much bigger than invertebrates.
1. Which animal is an invertebrate?