1. Body without scales

2. Larva aquatic 

3. External fertilization

4. Larva breathes through gill but adult through gills

1. Body stream lined

2. Bones air filled (pneumatic)

3. Fertilization internal

4. Exoskeleton made of feathers

5. Powerful wing muscles 

6. Presence of beak

Who devised the system of Binomial nomenclature?