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...
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