Answer:
A. theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning
Explanation:
Evolution deals with theories that supports how organisms are inter-related. The inter-relationship talks about the changes in organisms(physical) from generation to generation due to different traits being inherited from parents and environmental factors.
These factors plays a major role in how organisms evolve and change.
Evolutionary processes have been observed and various experiments conducted which supports the topic.
It is thought that humans had a tail that gradually disappeared after different generations. Fossil studies and lots of experimental comparisons and reasoning confirms this findings.
