If you were observing an early stage in human development at which endoderm,mesoderm,and ectoderm had just formed,you would be looking at a

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The formation of endoderm, mesoderm, and ectoderm occurs during the gastrulation stage, which is the process by which a blastula (hollow ball of cells) transforms into a gastrula (a multi-layered embryo with three germ layers). Therefore, observing the formation of these three germ layers would indicate that you are at the gastrula stage of development. A) zygote is the single cell formed when sperm and egg fuse. D) morula is a stage when the embryo is a solid ball of cells. C) embryonic stage and E) fetal stage come later in development, after the formation of the three germ layers.

If You Were Observing an Early Stage in Human Development