Metamorphosis in Arthropods What are arthropods? An arthropod ( arthro- , joint + podos , foot) is an invertebrate animal having an exoskeleton , a- segmented body, and jointed appendages (paired appendages). Arthropods form the phylum Arthropoda , which includes the insects , arachnids , myriapods , and crustaceans . The arthropod body plan consists of segments , each with a pair of appendages . The rigid cuticle inhibits growth, so arthropods replace it periodically by molting . Their versatility has enabled them to become the most species-rich members of all ecological guilds in most environments. They have over a million described species, making up more than 80% of all described living animal species, some of which, unlike most animals, are very successful in dry environments. What is metamorphosis? Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a consp
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