Answer: Blastocyst.
- A Blastocyst
- B Morula
- C Gastrula
- D Zygote
Correct answer: A. Blastocyst
Explanation: The blastocyst, with its trophoblast and inner cell mass, is the stage that attaches to and implants in the endometrium.
The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.