EVERYDAY SCIENCE

Detailed explanation-1: -Allopatric speciation (1) occurs when a species separates into two separate groups which are isolated from one another. A physical barrier, such as a mountain range or a waterway, makes it impossible for them to breed with one another.

Detailed explanation-2: -In allopatric speciation, groups from an ancestral population evolve into separate species due to a period of geographical separation. In sympatric speciation, groups from the same ancestral population evolve into separate species without any geographical separation.

Detailed explanation-3: -Answer and Explanation: Adaptive radiation is mainly allopatric. Adaptive radiation is a process in which organisms which are descended from a common ancestor rapidly diversify and become separate species which are specialized for survival in their unique environment.

Detailed explanation-4: -Correct answer: Allopatric speciation refers to the process by which a physical barrier separates a single population, causing two (or more) populations to arise and evolve due to environmental differences to become different species.