In simplest type of placenta. Six barriers separate mat ernal blood from foetal blood. How many barriers are lost in human placenta?

In simplest type of placenta. Six barriers separate mat ernal blood from foetal blood. How many barriers are lost in human placenta?
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In simplest type of placenta. Six barriers separate mat ernal blood from foetal blood. How many barriers ... form two haploid nuclei. C. three D. four
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