What changes in the external and internal structure occur in the tadpole during development.

In the process of development, the following changes occur in the internal structure of the tadpole: the gills are replaced by lungs, the second circle of blood circulation is formed and the three-chambered heart, the lateral line disappears (an organ that allows you to catch water vibrations), the development and complication of the sense organs occurs. In the external structure, the changes are as follows: the tail dies off, limbs appear, the lips change.