Annelida and Mollusca resemble in many embryo | vedclass

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(A) Annelida and Mollusca are closely related phyla in the animal kingdom.Both phyla exhibit $Spiral$ $cleavage$ during early embryonic development.Fu

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Spiral cleavage and mesoderm formation

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(A) Annelida and Mollusca are closely related phyla in the animal kingdom.Both phyla exhibit $Spiral$ $cleavage$ during early embryonic development.Furthermore,both groups show similar patterns of $mesoderm$ $formation$ from specific cells (often the $4d$ blastomere).These shared developmental characteristics suggest a common evolutionary ancestry,often grouping them under the clade $Lophotrochozoa$.

Annelida and Mollusca resemble in many embryonic features because both have

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