Examlex
Which function is best suited to return the specified number of characters from the middle of a text string?
Blastocyst
A stage within the germinal period of prenatal development in which the zygote has the form of a sphere of cells surrounding a cavity of fluid.
Trophoblast
The outer part of the blastocyst from which the amniotic sac, placenta, and umbilical cord develop.
Placenta
An organ connected to the uterine wall and to the fetus by the umbilical cord. The placenta serves as a relay station between mother and fetus for the exchange of nutrients and wastes.
Prenatal Activity
Activities or behaviors exhibited by a fetus in the womb, including movements and responses to different stimuli.
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