Populations of Larus gulls around the North Pole show an unusual pattern of reproductive isolation: each population is able to interbreed with its neigboring populations, but populations separated by larger geographic distances are not able to interbreed. This type of species complex is known as a(n):
a) ring species
b) linked species
c) polyploid species
d) circular species
e) Escher species
Ans: a) ring species
Biology & Microbiology
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