When does a non-kosher animal being slaughtered begin to impart full carcass impurity?
Halacha 1: while the non-kosher animal is still in death throes it has impure-food status only; it does not impart carcass impurity until decapitated or fully dead.
Question 2
What must an eiver min hachai (limb from a living animal) contain to impart impurity?
Halacha 3: a detached limb must be intact as created — flesh, sinews, and bones — with enough flesh to regenerate; otherwise it is pure.
Question 3
If a fetus is found alive inside an animal that was slaughtered, then the fetus dies before stepping on the ground, what is the fetus's status?
Halacha 7: the mother's slaughter purified the fetus; if it dies before stepping on the ground, it remains pure because the slaughter already took effect.
Question 4
What is the status of an animal slaughtered by a non-Jew, even if done perfectly with a sharp knife and a Jew supervising?
Halacha 9 (halacha 10 in text): slaughter by a gentile, Samaritan, or resident alien makes the animal a carcass and imparts carrying-impurity, even with proper technique and Jewish supervision — a Rabbinic decree.
Question 5
A sealed thigh bone (kulit) full of marrow — when does it impart impurity by touch?
Halacha 11 (halacha 12): a sealed kulit that was perforated even slightly causes impurity; if the marrow is rattling (cannot regenerate flesh), the unperforated bone is pure. If the marrow is intact and could regenerate flesh on the outside, it imparts impurity like other limbs.