Severely defective embryos usually do not survive.During which trimester do most spontaneous abortions take place? Explain why this is a critical period for the risk of miscarriage.In your answer,include two factors that could contribute to a spontaneous abortion during this period.

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The Answer of Severely defective embryos usually do not survive.During which trimester do most spontaneous abortions take place? Explain why this is a critical period for the risk of miscarriage.In your answer,include two factors that could contribute to a spontaneous abortion during this period.

Severely Defective Embryos Usually Do Not Survive