Give examples of the structure of the larvae characteristic of the ancestors of these animals.

The larval form of amphibians is a tadpole, which is characterized by gill slits, a lateral line, a two-chamber heart, and one circle of blood circulation. These signs indicate the kinship of amphibians and fish. In the process of metamorphosis, which occurs under the influence of the thyroid hormone, the tail dissolves, limbs appear, the lateral line disappears, the lungs and the second circle of blood circulation develop.

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