Adaptations are what organisms do in order for them to survive and adapt to the environments that Mother Nature is presenting them. 
1. Crocodiles - have tough and scaled skin that allows them to camouflage and catch prey in the water 
2. Frogs - have developed bodily fluids that secrete poison to prevent predators from attacking them 
3. Bats - have developed their echolocation to help them in hunting for food at night time. 
4. Coelachants - have maintained their extra fins for sensory motor in the water
5. Lampreys - have maintained their tooth-funnel like mouths in order to feed on their hosts.