What process is responsible for the formation of the three germ layers during embryonic development?

• A. Organogenesis
• B. Fertilization
• C. Neurulation
• D. Gastrulation

Answer: (D)

Verified step by step guidance

1. Understand the context: The question is about embryonic development, specifically the formation of the three germ layers.
2. Identify the key terms: The three germ layers are the ectoderm, mesoderm, and endoderm, which are crucial for the development of different tissues and organs.
3. Review the options: Organogenesis is the formation of organs, fertilization is the union of sperm and egg, and neurulation is the formation of the neural tube.
4. Focus on gastrulation: Gastrulation is the process during which the three germ layers are formed. It involves the movement and differentiation of cells in the early embryo.
5. Conclude with the correct process: Recognize that gastrulation is the specific process responsible for forming the three germ layers, setting the stage for further development.