Which of the following processes happens last?
Correct answer: A. Gastrulation
- A. Gastrulation
- B. Implantation
- C. Fertilization
- D. Ovulation
Explanation
Gastrulation is a process that occurs after implantation, where the blastocyst undergoes further developmental changes, leading to the formation of three germ layers: ectoderm, mesoderm, and endoderm. Gastrulation marks the beginning of embryonic development and occurs after implantation, usually around 2-3 weeks after fertilization.
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About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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