Which field of study focuses on the development of embryos?

Embryology is the field of study that specifically focuses on the development of embryos from fertilization to the fetal stage. It encompasses the understanding of the processes involved in the formation and growth of organisms during their early stages. This includes the study of cell division, differentiation, organogenesis, and the overall transitions that occur as the embryo develops into a more complex organism.

Genetics primarily deals with the heredity and variation of traits through genes, but it does not exclusively focus on the embryonic development process itself. Histology, on the other hand, is the study of tissues and cells at the microscopic level, investigating their structure and organization, rather than focusing solely on embryo development. Ophthalmology is a branch of medicine concerned with the diagnosis and treatment of eye disorders, which is unrelated to embryonic development. Hence, embryology is the most appropriate and correct answer, as it is dedicated specifically to understanding the stages and intricacies of embryonic development.