Title: Bird migration.
Question: What is a primitive trait present even in non migrating birds?

Title: Paper.
Question: Which Canadian inventor helped F.G. Keller to develop their own process?

Title: Separation of powers under the United States Constitution.
Question: Which Enlightenment thinker was against the separation of powers?

Title: Roman Republic.
Question:
Would the Comitia Centuriata occasionally be called upon to serve as the highest court of appeal?