What is the meaning of "Mafreses Parsah" and "Shosa'as Shesa Sh'tei P'rasos"?
What are the connotations of the word "ba'Beheimah"?
Rashi: It implies that an animal within an animal is permitted - from which the Chachamim learn that one may eat a fetus that one finds inside a Shechted animal.
What is this Pasuk coming to teach us?
Rashi (on Pasuk 20): It is coming to add an Asei on the Lo Sa'aseh against eating the non-Kasher species of animals.