Short Answer
Refer to the figure showing a sea urchin gastrula. 
Identify the structures labelled a-g in the figure, using the following terms: archenteron, ectoderm, filopodia, primary mesenchyme, secondary mesenchyme, blastocoel, blastopore.
Correct Answer:
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a. Blastocoel
b. Blastopore
c....View Answer
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Correct Answer:
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b. Blastopore
c....
View Answer
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