His zoological studies included works on the genitals of vertebrates, foie gras, comparative embryology of fish and carcinology.

This was a theory that attempted to provide a link between comparative embryology and a "pattern of unification" in the organic world.

In this section, Heilmann draws evidence from his observations of germ cells, impregnation, cell division, ontogeny and comparative embryology about the probable ancestry of birds.

Haeckel used the term Anthropogeny to refer to the study of comparative embryology and defined it as "the history of the evolution of man".

In some of its facets anatomy is closely related to embryology, comparative anatomy and comparative embryology, through common roots in evolution.

The original statutes required the lecturer(s), appointed annually, to deliver "one or more lectures or lecture demonstrations on comparative or experimental embryology".

Haeckel's work and the ensuing controversy linked the fields of developmental biology and comparative anatomy into comparative embryology.

The law of parallelism was a means of linking comparative embryology into the search for a unifying pattern in the organic world.

Karl Ernst von Baer (Russian embryologist, 1792-1876) was the founder of comparative embryology.

High school students use chicks to learn about comparative embryology, but given proper instruction, even kindergartners can become good surrogate hens.