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yolk sac

n.
1.membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
2.membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes

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    Idiom of the Day

    confuse (someone or something) with (someone or something)
    to fail to distinguish between two things or people
    I always confuse our new teacher with our previous teacher. The boy confused one word with another word.



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    Lassitude

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