1. Crabs and Prawns A. Book lungs2. Spiders and scorpions B. Book gills3. King crab ( limulus) E. Trachea4. Insects D. Gills
1. Body stream lined2. Bones air filled (pneumatic)3. Fertilization internal4. Exoskeleton made of feathers5. Powerful wing muscles 6. Presence of beak