Invagination in the Sea Urchin Blastula

question 75

Multiple Choice

Invagination in the sea urchin blastula

• A) forms the neural tube.
• B) involves contractile filopodia extending from the endoderm cells.
• C) creates a blastopore that becomes the mouth.
• D) forms the archenteron.
• E) occurs just prior to the blastula stage.

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