In deuterostomes, second opening forms

Anus

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Mouth

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Nose

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Both A and B

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Solution

The correct option is B Mouth
Protostomes and deuterostomes is based on the direction of the mouth develops in relation to blastopore. Protostomes means first mouth, so in this first mouth will form. Deutrostomes means second mouth, so in this first anus then mouth will form.
So, the correct answer is 'Mouth'.

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