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Like their exteriors, the internal organs of arthropods are generally built of repeated segments.Their nervous system is "ladder-like", with paired ventral nerve cords running through all segments and forming paired ganglia in each segment.Likewise, the relationships between various arthropod groups are still actively debated.Arthropods contribute to the human food supply both directly as food, and more importantly indirectly as pollinators of crops.Arthropods' methods of reproduction and development are diverse; all terrestrial species use internal fertilization, but this is often by indirect transfer of the sperm via an appendage or the ground, rather than by direct injection.
The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting.
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Arthropods range in size from the microscopic crustacean Stygotantulus up to the Japanese spider crab.
Arthropods' primary internal cavity is a hemocoel, which accommodates their internal organs, and through which their haemolymph – analogue of blood – circulates; they have open circulatory systems.