Reader: Unit 2 Chapter 3

What is a key characteristic that scientists study to classify animals?

• Presence of a backbone

• Color of the skin

• Size of the animal

• Diet of the animal

Which of the following animals is a vertebrate?

• Butterfly

• Earthworm

• Rabbit

• Jellyfish

What is another name for a backbone?

• Spinal cord

• Spine

• Nerve bundle

• Vertebra

Which group of animals is the largest in the animal kingdom?

• Mammals

• Insects

• Reptiles

• Birds

Which of the following animals is an invertebrate?

• Shark

• Lizard

• Crab

• Eagle