Question

eutherian mammals are
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Answer 1

eutherian mammals. Any from the group of mammals possessing chorioallantoic placenta

Answer 2

Eutheria includes one of three major clades of mammals, the extant members of which are referred to as placentals. Eutheria (or Placentalia) is the most taxonomically diverse of three branches or clades of mammals, the other two being Metatheria (or Marsupialia) and Prototheria (or Monotremata).