Arthropods

butterfly insect

crab crustacean

spider arachnid

centipede myriapod

1. They all have exoskeleton's it protects the organs inside their body. 
2. Their  is  millions of arthropods around us.
3. They must molt ore shed their exoskeleton as they grow because it doesn't come with it
4. They are the largest group of animals because they are divided into smaller group with similar characteristics.
5. Their are different group called insects, myriapod ,arachnid and crustacean.