Final answer:
The liver cells during the blastula stage of development originate from the endoderm germ layer. The blastula undergoes gastrulation to form the three primary germ layers, of which the endoderm layer differentiates into various internal organs, including the liver.
Step-by-step explanation:
The student asked which of the given options forms the liver cells during the blastula stage of development. The correct answer is c) Endoderm. The early stages of embryonic development commence with fertilization, leading to the formation of the blastula, which then undergoes gastrulation forming three distinct germ layers: the ectoderm, mesoderm, and endoderm. Each of these layers differentiates into different types of cells and tissues in the body.
The ectoderm gives rise to the nervous system and the skin, whereas the mesoderm forms muscle cells and connective tissue. The endoderm is responsible for developing many internal structures, including the liver, pancreas, and lungs. Therefore, the liver cells originate from the endoderm layer of the developing embryo.