Give three examples of degeneration of animals or plants, and prove that degeneration does not always lead to biological regression.

General degeneration – represents evolutionary changes that lead to a simplification of the organization, to the loss of a number of systems and organs. Degeneration is often associated with a transition to a cave, to a sedentary or parasitic lifestyle.
1) The degeneration of the organs of vision in moles does not interfere with their life underground, and their numbers increase.
2) Tapeworms have lost the digestive system, but are perfectly parasitic in other organisms.
3) The dodger is characterized by a decrease in the activity of the photosynthesis apparatus, reduction of leaves to scales, transformation of roots into suckers – parasitizes on higher plants and is a malicious weed.