Examlex
Which issue is at the top of the list of the things couples fight about?
Zygote
The initial cell formed when a new organism is produced by the joining of a male sperm and a female ovum.
Blastocyst
An early stage embryo consisting of a sphere of cells surrounding a fluid-filled cavity and a cluster of cells inside known as the inner cell mass, which eventually develops into the fetus.
Fetus
A developing mammal or human from the end of the embryonic stage (usually from nine weeks after fertilization) to birth.
Blastocyst
A stage of embryonic development characterized by a fluid-filled structure formed about 5-6 days after fertilization, preceding implantation in the uterine wall.
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