Question:

Occurrence of endemic species in South America and Australia is due to

Updated On: Aug 15, 2022
  • extinction of these species from other regions
  • continental separation
  • absence of terrestrial route to these places
  • retrogressive evolution
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The Correct Option is B

Solution and Explanation

Seas form the barriers to free intercontinental movement and separates the continents, causing evolution and endemism. Endemic species are those species which are in a restricted area.
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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.