Gill is related to Lamellae in the same way as Lung is related to.......?

Kilometre is to Distance as Poundal is to

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Given set : $4718, 5617, 6312, 8314$

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Virology : Virus : : Semantics : ?

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Devika Rani : Sohrab Modi : Raj Kapoor

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Pituitary : Brain : : Thymus : ?