Answer:
Blastocyst
Step-by-step explanation:
After sexual intercourse, the sperm cells swim to the egg cells. The sperm cell then fertilize the egg and gets attached to it to form one. The fertilized egg is also called BLASTOCYST.
The blastocyst then swims to the mucosa of the endometrium which is the inner lining of the uterus and gets implanted to it.