How to explain the great variety of nature in Indonesia.

Indonesia is a country located on 17,000 islands that stretch for thousands of kilometers from north to south and from west to east. Living conditions are quite diverse. A feature of the island flora and fauna is their endemicity. The open sea is an insurmountable obstacle for many animals and almost all plants. In nature, the fittest survives, this is how natural selection takes place. Living organisms living on different islands accumulate changes in appearance, in the work of the body, gradually and irreversibly. This phenomenon in biology is called evolution. This is the reason for the diversity of nature in Indonesia.