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This description does not fit any known living animals.Reptiles are cold-blooded, breathe with lungs, usually lay eggs and have scaly skin, but they do not have scales. The only creatures with scales are fish, and they do not breathe with lungs.
the silver back whale is the only whale to lay eggs instead of giving live birth it is also the largest whale in the world and has three lungs <^>
platypus are born from eggs and have sticky pads but no scales.
reptiles
ostrich
Lizards.
Fish.
Penguins
It is a spelling error. It should be "Reptile". A reptile is a kind of animal that lives on land, has scales, and lays eggs.
All fish have gills needed to survive under water
Fins, scales, reproduction via eggs, life in water.
Lungs were needed so that they could survive on land for an length of time. But they could still lay eggs in the water. To move away from the water it was necessary that eggs had shells, so they didn't dry out during development. Both were important, but the answer has to be lungs. Without lungs, they wouldn't have been able to get away from the water at all, so shelled eggs would have served no purpose anyway.