Final answer:
Embryonic stem cells and germ layers both arise from the blastula itself during embryonic development. The inner cell mass of the blastula is where embryonic stem cells originate, and germ layers are formed during gastrulation.
Step-by-step explanation:
The accurate statement that describes where the embryonic stem cells and germ layers originate after the blastula is formed is: Embryonic stem cells and germ layers originate from the blastula itself. Specifically, the inner cell mass (ICM) of the blastula is a source of embryonic stem cells. During a process called gastrulation, the cells of the blastula rearrange to form three primary germ layers: the ectoderm, the mesoderm, and the endoderm. The ectoderm develops into the nervous system and skin, the mesoderm forms muscles, the circulatory system, and bones, while the endoderm gives rise to internal organs like the gut and lungs.
The embryonic stem cells and germ layers originate from the blastocoel present inside the blastula. The blastula is a stage in embryonic development that follows the formation of the zygote. During gastrulation, the blastula undergoes rearrangement of cells, giving rise to the three germ layers - ectoderm, mesoderm, and endoderm. These germ layers differentiate into various tissues and organs.