Medical biologists are researching a fertility disorder that prevents developing offspring from forming the structures they need to maintain nourishment and continue development. Therefore, development ceases early during gestation. What is the final stage of development that these offspring could reach before development stops?

The zygote divides and develops into a blastocyst, which implants and begins forming structures that support nourishment and continued development. If those supporting structures cannot form, development would stop early, before the fetus stage. Thus the blastocyst is the latest listed stage the offspring could reach.

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