Sibley & Ahlquist's Phylogeny and Classification of Birds (1990) is a landmark work on the classification of birds, although frequently debated and constantly revised.

Anderson noted in an interview with IndieWire, "Freedom of speech is not an absolute, it's almost a living thing that needs to be constantly debated and talked about or we'll lose it.

The best themed dinner or Arucha is constantly debated, and with no detailed records, it will never be known just how fantastic old aruchot were.

Optimal taxation, which is the theory of designing and implementing taxes that reduce inefficiency and distortion in the market through Pareto optimal moves under given constraints, is constantly debated.

While the average THC content of G-13 is constantly debated, it likely exceeds that of most other strains.

How much of that change is attributable to Mr. Koizumi's policies is constantly debated among experts.

"Because of its complexity," the statement continued, "this subject is constantly debated within our department and in academic pediatric centers across the country."

Those questions are being debated constantly in Chicago, where the playoff fate of the Bears could rest largely in Grossman's hands.

Gender identity and related topics are constantly debated within politics.

Whether or not there should be a directive will be debated constantly with the European Parliament, but we can only present directives when we are ready and the circumstances are right.