Assertion: embryo's cell | /r/HasProperty | morula day
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Source sentences:
text: The first days and weeks after conception: mitotic cell divisions begin, converting the zygote to a multicellular organism Day 1: first cleavage - 1 cell becomes 2 Day 2: second cleavage - 4-cell stage Day 3: 6-12 cell stage - can test at this stage for genetic diseases if done by IVF Day 4: 16-32 cell stage - solid ball of cells - morula Day 5: Solid morula develops into hollow, fluid-filled blastula