Well said; I can delete my (later) sibling comment! > Molting is one of the features that makes difficult for arthropods to reach great sizes Also, chitin bec

Well said; I can delete my (later) sibling comment! > Molting is one of the features that makes difficult for arthropods to reach great sizes Also, chitin becomes too heavy. Somehow, it's connected to body mass increasing as the cube of length, but I don't remember exactly how. Maybe the chitin legs would have to be too strong. > their skeleton and tegument cannot grow between moltings To clarify an essential aspect: because their rigid exoskeleton can't grow, they must shed and replace it for their body to grow.