There are also a lot of animals without backbones. These are called invertebrates and are part of the phylum arthropoda (arthropods). Two of the most commonly known classes in this phylum are arachnids (spiders) and insects.
Arthropods
Arthropods is a huge phylum of animals -- it includes eleven animal classes: Merostomata, Pycnogonida, Arachnida, Remipedia, Cephalocarida, Branchiopoda, Maxillopoda, Malacostraca, Chilopoda, Diplopoda, and Insecta. Any animals that have more than four, jointed legs are arthropods. Insects, spiders and crustaceans all belong to this class of animals. Insects , Spider , Grasshoppers , Praying Mantis , Dragonfly , Butterfly , Bees
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