Question

On what do biologists base their belief in evolutionary theory?

Answer 1

A scientific theory is a concept that has been highly tested by many scientists, is supported by overwhelming evidence, and is considered to be a valid explanation of a specific natural phenomenon. Evolution, just like gravity, is one example of a scientific theory. This theory is rooted in multiple forms of supported scientific evidence.

Answer 2

The theory of evolution is based on scientific evidence from multiple scientific disciplines, which have been tested and supported by many studies. Biological lines of evidence show homologies, or similarities, across groups of living things, which indicate a shared ancestor. Examples include molecular evidence, which shows similarities of DNA, RNA, and proteins; comparative anatomy, which shows similarities of morphology and anatomy; and embryology, which shows similarities of embryonic and fetal development. The more similar the comparative study, the more closely related the species are.