During embryogenesis, which of the following is MOST accurate concerning the blastopore:

W) it does not exist in protostomes

X) it originates before the blastula stage

Y) it forms the anus in deuterostomes (read as: DOO-ter-oh-stomes)

Z) it is the hollow center of the gastrula
Y) IT FORMS THE ANUS IN DEUTEROSTOMES