Title: Avicenna.
Question: What two subjects of Avicenna's have been reprinted extensively?

Title: On the Origin of Species.
Question: When was The Variation of Animals and Plants under Domestication by Charles Darwin published?

Title: Central African Republic.
Question: What river saw the establishment of a new Kingdom?

Title: Annelid.
Question:
How much of near-shore marine annelids are burrowing?