Which characteristics allow the fetus to thrive, despite a lower than average blood po2?

A fetus that has a low PC02 will also suffer the fetal hemoglobin carrying more oxygen than usual. The pH of the fetus blood will become higher than that of the mothers blood. It will carry more oxygen than the typical adult hemoglobin does.

Dna overload will occur

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the