Answer:
The description corresponds to an observational study.
Explanation:
In Observational studies, researchers observe the effect of a risk factor without changing what is exposed to it or its conditions. On the other hand, in an experimental study, researchers can introduce a change and study the effects of it.
Scientists thought that modern man and Neanderthals were far less evolved, but in fact Neanderthals and modern man had much more in common and were more similar to what scientists originally thought.
This kind of "mistake" is normal because science is not completely correct, and everything is done through experimentation and hypotheses that lead to testing.
