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
1. Body without scales2. Larva aquatic 3. External fertilization4. Larva breathes through gill but adult through gills