I think the answer is young adulthood
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.
The text feature that most likely would help Liam is "pronunciation guide". However, since he is looking for the name of a dinosaur, Liam should take into account that he needs a pronunciation guide of the Latin language. Scientific names are given by Latin roots, so the name of a species is pronounced in Latin.