All arthropods have jointed legs with claws. All ametabolous insects are apterygote.
All orthopteroid orders are hemimetabolous.
All holometabolous orders are endopterygote. All chelicerate arthropods are aquatic. A. Isoptera C. Mecoptera B. Psocoptera D. Coleoptera 8. They are paleopterous 10. A. Hymenoptera C. Thysanoptera B. Hemiptera D. Siphonaptera 11.