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The external similarity between two structures, which have the same function but do not have an identical embryonic origin.
Sympatric speciation
Sympatric speciation: The formation of new species in the same environment without being geographically isolated.
Homology
The internal similarity between two structures that have the same embryonic origin.
Allopatric species
Allopatric species live in different environments.
Allopatric speciation
Allopatric speciation: The formation of new species in different environments; this process starts with geographic isolation.
Sympatric species
Sympatric species live in the same environment; they, therefore, belong to the same biological community.
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