Summary/Conclusion

Embryology is basically the branch of biology that relates to the study of early growth and development of living organisms and in some ways it supports evolution.

For example, many mammals have similar anatomies as embryos, but in later stages start to develop their unique characteristics. Another example is that humans had gill slits as embryos like fish. This showed that fish and humans could have a common ancestor.

Scientists now understand that an organism's genes dictate their development in the early embryonic stages of life. It's the idea that a common ancestor has many of the same genes that the offspring has. When an organism is developing we see similar genes of ancestors being expressed, especially in the early stages of development. It is not until later stages that we see genes that the organisms do not have in common.