Multiple Choice
Which feature characterizes the sea urchin archenteron?
A) It requires the primary mesenchyme to form.
B) It is derived from mesoderm.
C) It is elongated by contraction of filopodia extending from secondary mesenchyme.
D) The anus forms as a secondary opening.
E) Its open end is the blastopore, which becomes the mouth.
Correct Answer:
Verified
Correct Answer:
Verified
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