A researcher has found variation in courtship behavior among closely related species. She has determined that simple courtship dances are the ancestral form of the trait, while complex courtship dances are derived. This research approach is an example of which of the following? The observational method The comparative method The proximate method O The experimental method

The researcher used the comparative method to explore the courtship behavior variation between closely related species.

Explanation:

Comparative research method:

It is a research technique which is used to compare the features, cultures, or anything from similar to different behavior.

This is the best example of comparative research method because she compared the courtship behavior in species which are closely related. After comparison, she found that ancestral form is simple courtship dances while derived form is complex courtship dances.

So, according to this example the research approach used is the comparative research method.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."