In which of the following animals the embryos develop fully the mother's body and in which they develop fully in the eggs laid by mother?
Cow, Ostrich, Frog, Lizard, Deer, Cat, Snake, Tiger, Dog, Hen
Cow, deer, cat, tiger dog - embryos develop fully the mother's body
Ostrich, frog, lizard, snake, hen - develop fully in the eggs laid by mother