If snakes are taken out of the environment, the population of salamanders would rise significantly due to the lack of a predator, resulting in an over-hunting of earthworms, causing earthworm populations to fall.
II -rib cage
The first one looks like the esophagus
3rd one- lungs
4th one diaphragm
So a change in an organism's DNA can cause changes in all aspects of its life. Mutations are essential to evolution; they are the raw material of genetic variation. Without mutation, evolution could not occur.