The figure shows where tetrapod limbs evolved ("Origin of tetrapod vertebrates") in the evolutionary history of animals. Based on this figure, in which limbless organisms would you expect to find vestigial limbs? 
Definitions:
Soviet Union
A socialist state that existed from 1922 to 1991, comprising Russia and several other republics, and was a major world power during the 20th century.
Lenin's Death
Refers to the death of Vladimir Lenin in 1924, which marked the end of his leadership of the Soviet Union and initiated a struggle for power.
Tsarina Alexandra
The last Empress of Russia, wife of Tsar Nicholas II, known for her influence at court and connection to the mystic Rasputin.
Russian People
Citizens or nationals of Russia, a transcontinental country located in Eastern Europe and Northern Asia, known for its rich history, cultural heritage, and diverse ethnic groups.
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