Would you use an observational, experimental, or modeling approach to study a rare, endangered bird species

The correct answer would be - observational approach.

Explanation:

Observation approach is the research technique that involves the observation  of the subject or participates behavior in their natural habitat or state. This will be one of best approach to study.

Similarly when characterizing new findings various aspect of  experimental, Observational details or modelling approaches will help in identification , classification and nomenclature. However, in comparison to experimental and modeling approach is more appropriate method for the rare endangered species.

Thus, the correct answer would be - observational approach.

1. a tropical dry forest carries out more rapid nutrient cycling