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What is the difference between sympatric and allopatric forms of speciation?

Speciation refers to an evolutionary process of organisms by which over the period of time members of one population evolve to become new species. There are two types of speciations 
  • Sympatric speciation
  • Allopatric speciation
Sympatric speciation is the theory that states that over the period of time some individuals of a population changed due to different stressors such as shelter, food sources, competition  while other members of the population remained the same. The group that changed emerged as a new species of population.
Allopatric speciation takes place when members of the population are geographically separated and each member in different geographical conditions evolved into a new species.

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