- Plus,theexoskeletonprovidesthermalmassforinsulationandothereco-friendlyassistance.Theirhardoutershell,calledtheexoskeleton,doesnotgrowwithcrawfishandisshedperiodically.Tarantulashaveanexoskeleton(thatmeansitsskeletonisontheoutside)likecrayfishandcrab...
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