Do all mammals contain a placenta
Do all mammals contain a placenta?
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Mammals of the monotreme group (that is, platypus and echidnas) are oviparous, egg-laying, and they do not encompass a placenta. Mammals of the marsupial group (that is, kangaroos, koalas and opossums) do not contain a placenta either; females of this group give birth to embryonic young that then carry on growth in the mother’s pouch. Placenta just forms in female placental mammals.
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Thin layer chromatography is a method of chromatographic analysis where sample is separated between adsorbent and solven. The sample gets selectively adsorb depending on the rate of differential migration,but the sample with various disorders shows ex
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