Answer :
Answer:
The fertilized egg (zygote)
Explanation:
the egg divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst.
Answer:
The fertilized egg (zygote)
Explanation:
the egg divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst.