Blastula lacks

Blastomeres

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Blastoderm

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Blastocoel

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Blastopore

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Solution

The correct option is D Blastopore
Blastula means hollow sphere of cells called as blastomeres and it has an inner fluid-filled cavity called as blastocoele. Blastoderm surrounds the blastocoele and it consists of a layer of blastomeres.
A blastopore is an opening into the gastrula.
Thus, the correct answer is option D.

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