Which of the following is not a Von Baer’s principle of embryology?

Karl Ernst von Baer noted that embryos never pass through the adult stages of other animals. They resemble the embryos of their ancestors.

Von Bear’s Principles of Embryonic Differentiation:

1. The more general characters of a large group appear earlier in the embryo than the more special characters.
2. From the more general, the less general and finally the specialised characters appear.
3. An animal during development departs progressively from the form of other animals.
4. Young stages of an animal do not resemble the adult of any other form, but they resemble its embryo.