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russia
It was the Soviet Union
Southeast Asian countries
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socialism
Southeast Asian countries
Yemen
In some locations, they may be too closely related to marry. But this is a peculiarity of United States culture; in quite a few countries, cousins are regarded as ideal marriage partners.
What is RNA closely related too? What is RNA closely related too?
Yes. The entirety of humanity is related. It just happens that people from different ethnic backgrounds are typically less closely related than people from the same ethnic background. (Most countries are not monoethnic, for example, an Italian-American is probably more closely related to an Italian from Genoa and a Frenchman from Nice than his African-American neighbor.)
Eagles are closely related to hawks.
Closely related: obelia jellyfish Not closely related (but still related): coral sea anemone