It would be the first option. Adenine and thymine.
Answer:
Implantation is the mechanism by which a blastocyst, which is passing through the uterus as a developing embryo, makes contact with the uterine wall and remains bound to it before birth. The uterine lining (endometrium) undergoes several internal modifications in order to allow for the emerging blastocyst to bind to it.
Explanation:
- Eijiro <3
The answer to your question should be a and c hope this helps
