By deep freezing, it is possible to preserve foetus which is

1 - day old

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2 - day old

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3 - day old

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1 - week old

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Solution

The correct option is D 1 - week old
A liquid called cryoprotectant is added to protect the embryos during freezing. By deep freezing, it is possible to preserve foetus which is 1-week old. Therefore, the correct answer is option D.

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