At gastrulation, which forms first in worms like C. elegans? Question 92 options: the liver the mouth the anus the gonads
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The blastocoel forms during cleavage and is displaced by the primitive gut during gastrulation. The outermost germ layer in the gastrula is the ectoderm. The primitive gut consists of nutrient-rich cells and is surrounded by the blastopore in the late gastrula. The primitive gut is lined with endoderm. The mesoderm lies between the endoderm and ectoderm. The blastopore is formed by a tube of endoderm. The first opening of the primitive gut is called the yolk plug, which eventually develops into the frog's anus.
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The archenteron develops into (A) the mesoderm. (B) the endoderm. (C) the placenta. (D) the lumen of the digestive tract.
Animals with bilateral symmetry are divided into two clades: Protostomes and Deuterostomes. Protostomes means ... Group of answer choices The organism develops the anus first from the blastopore, mouth develops from another region of the embryo. The organism develops the mouth first from the blastopore, anus (if present) develops from another region of the embryo. None of the choices. The organism develops only one opening from the blastopore, which functions as the mouth and anus.
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