The study of comparative embryology reveals the conservative nature of the genes responsible for?

A. embryonic development.
B. intelligence.
C. reproductive behavior.
D. size
E. food procurement.

The study of comparative embryology reveals the conservative nature of the genes responsible for?
A. embryonic development.———————————-Comparative Embryology
It has long been hypothesized that small changes in the pattern of cell division, cell migration, and programmed cell death in early embryogenesis could result in significant patterning differences latter in development due to altered cell-cell signaling. In turn these altered developmental programs could lead to large changes in tissue and body morphologies. This field of comparative embryology examines the early growth of related animals to try to identify these types of differences and to correlate them with later developmental differences. As nematodes have largely invariant cell lineages from a single cell zygote to the adult and as the complete lineage is known for C. elegans. Nematodes are ideal for this sort of comparative approach. Indeed studies have shown that specific changes in the pattern of blastomeres divisions underlie some of the major divisions of the nematode phylum.http://www.wormclassroom.org/eb/ebComEmbryo.html