I make my living as a biologist who studies animal populations. My undergraduate degree was in biology, and my master's degree in ecology. In my areas of study, as well as in others, evolutionary theory is THE unifying paradigm that ties together diverse observations. All these sciences offer independent evidence of biological evolution. The knowledge base grows more extensive each year.
Science is a process of discovery about things that can be measured.
The basic steps of the process are observation, hypothesis formulation, hypothesis testing, and explanation. Science is a process of understanding cause and effect, and ultimately having the understanding to make inferences and predictions. Evolutionary theory is the entire body of knowledge resulting from more than a century of scientific progress in understanding the diversity and distribution of species on this planet, past and present. Creationism is a religious view, not a science. Dozens of creation scenarios can be found in the religions of the world.