Answer: 8-cell stage.
- A 2-cell stage
- B 4-cell stage
- C 8-cell stage
- D 16-cell stage
Correct answer: C. 8-cell stage
Explanation: In IVF-ET, the embryo is typically transferred into the uterus at the 8-cell stage. Earlier or later transfers are also performed but 8-cell is standard.
Contraceptive methods span a spectrum from temporary/natural to permanent/surgical; condoms stand out as the only method offering STI protection alongside contraception.
Concept context
Understand reproductive health, family planning, contraception methods, STIs, population control, and assisted reproductive technologies.