Multiple choice general knowledge science & technology Archinida Scorpionida Porcupine Scorpion Rattle Snake Whale Shark Reveal answer Fill a bubble to check yourself B Correct answer Explanation Arachnida is the class that includes scorpions, and Scorpionida is the order of scorpions. Porcupines are mammals, rattlesnakes are reptiles, and whale sharks are fish - none belong to the arachnid class.