Answer to Question #99260 in Zoology for Helen Najera

Question #99260
What information about the Devonian tetrapods leads to the conclusion that tetrapods evolved in the water rather than on land?
Expert's answer

The common ancestor of tetrapods vertebrate had fins (with lepidotrichia), scales, gills, and lived in the water.They also had air bladders (air-filled sacs) connected to the back of their throats that could be used for breathing air (i.e., as lungs) or for buoyancy control. The air bladders of many ray-fins no longer connect to their throats, and so they are not able to breathe air. In these ray-fins, the air bladder is used mainly for buoyancy control and is known as a swim bladder.However, tetrapods have taken an alternative route: they have lost the buoyancy control function of their air bladders, and instead this organ been elaborated to form the lungs that we all use to get around on land.

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