It is called speciation.
A Barrier Reef. The barrier reefs grow parallel to the shore of an island and are separated from it by a deep lagoon.
barrier reef
A shallow body of water that is separated from the open sea is called a lagoon. Lagoons are also commonly referred to as back reefs.
Geographic isolation refers to a barrier, such as a body of water or a mountain range, that physically separates two populations of a species. This isolation can lead to genetic divergence and eventually speciation as the separated populations evolve independently.
Barrier reefs form parallel to the shoreline but are separated by a lagoon.
Barrier reefs form parallel to the shoreline but are separated by a lagoon.
demountable barrier
The line perpendicular to a barrier is called the normal.
A body of water that is encircled by a coral reef is called a lagoon. A lagoon is usually shallow and is separated from the ocean by coral reefs, barrier islands, or sandbars.
If you're referring to the barrier that separated communist countries in Europe from non-communist countries, the answer is the Berlin Wall.
Why himalayas are called barrier of India