Animal World

Arthropods: Crustaceans, Insects, and Spiders

Why are arthropods considered the most biologically successful phylum of animals?

Members of the phylum Arthropoda are characterized by jointed appendages and an exoskeleton of chitin. There are more than one million species of arthropods currently known to science, and many biologists believe there are millions more to be identified. Arthropods are the most biologically successful group of animals because they are the most diverse and live in a greater range of habitats than do the members of any other phylum of animals.


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