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A population that becomes divided (isolated) by a physical barrier, allowing each of the separated groups an independent evolutionary path.
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
It is called speciation.
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.
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.
Why himalayas are called barrier of India
If you're referring to the barrier that separated communist countries in Europe from non-communist countries, the answer is the Berlin Wall.
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.