Are Bacteria or Archea ancestor of eukaryotes?

These findings inspired the hypothesis that the archaeal ancestor of eukaryotes was an unusually complex form with an elaborate intracellular organization. ... To begin with, a typical eukaryotic cell has a three to four orders of magnitude larger volume than most bacteria and archaea [3–5]

Explanation:

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the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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