Answers

2015-08-11T18:44:29+05:30
Dolphins are no fishes, they are also mammals. so they breathe through lungs. they cannot stay underwater for a long time. they have to come on the surface to breathe.
crocodiles posses lungs and breathe air.
Ichthyosaur is the scientific name.
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2015-08-12T19:45:05+05:30
Crocodile and dolphin have good respiratory system
they can live in water 1 to 2 hrs without taking breath
 
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