Around the country, there are many biology research centers, each being associated with many researchers. Each researcher can be associated with only one research center.

Each researcher has only one specialty (such as immunology, genomics, etc.), for which we need to capture a name and description. Although a specialty includes many researchers, only one of them will be its leader. A researcher may not be the leader of more than one specialty.

Whereas a researcher is identified by a unique ID and has a name and title, a research center is identified by a name and it has an address.

Draw the conceptual data model (following the textbooks conventions) to accurately represent the above situation. Please do not show FKs in your data model; this is a technical concern, not a conceptual one!