Premise: Spiders ( order Araneae ) are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom . They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms . Unlike most arthropods , spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure . Spider-like arachnids with silk-producing spigots appeared in the Devonian period about , but these animals apparently lacked spinnerets . Venom . Venom is a form of toxin secreted by an animal for the purpose of causing harm to another .
Hypothesis: Spiders are planets.
Label: CONTRADICTION