Respuesta :
Answer:
A blastocyst comprises of about 200 - 300 cells, following rapid cleavage.
Explanation:
In humans , blastocysts formation begins about 5 days after fertilizations.
The blastocyst has a diameter of about 0.1 - 0.2 mm .
The inner cell mass is also a source of embryonic stem cells.
I think that your answer would be at least 200 to 300 cells that make up a blastocyst.
Hope this helps