Assertion: embryo | /r/AtLocation | the mother
Facets:
value: by a placenta
type: OTHER
Source sentences:
text: Development may be internal, with embryos retained in the female’s oviducts, and embryos of some species may be attached to the mother by a placenta.
text: Embryos are attached to their mother with a yolk sac placenta, which is how they receive their nutrition.