Question: The global dog population is estimated at 525 million:225 based on a transparent methodology, as opposed to other estimates where the methodology has not been made available all dog population estimates are based on regional human population densities and land uses.
Is there an answer to this question: What are dog population estimates based on other than land uses?

Answer: human population densities

Question: At the beginning of the Han dynasty, every male commoner aged twenty-three was liable for conscription into the military. The minimum age for the military draft was reduced to twenty after Emperor Zhao's (r. 8774 BC) reign. Conscripted soldiers underwent one year of training and one year of service as non-professional soldiers. The year of training was served in one of three branches of the armed forces: infantry, cavalry or navy. The year of active service was served either on the frontier, in a king's court or under the Minister of the Guards in the capital. A small professional (paid) standing army was stationed near the capital.
Is there an answer to this question: Which Minister could a conscripted soldier expect to serve under during his year of service?

Answer: Minister of the Guards

Question: Late in the 19th century, Paris hosted two major international expositions: the 1889 Universal Exposition, was held to mark the centennial of the French Revolution and featured the new Eiffel Tower; and the 1900 Universal Exposition, which gave Paris the Pont Alexandre III, the Grand Palais, the Petit Palais and the first Paris Metro line. Paris became the laboratory of Naturalism (Emile Zola) and Symbolism (Charles Baudelaire and Paul Verlaine), and of Impressionism in art (Courbet, Manet, Monet, Renoir.)
Is there an answer to this question: What was the purpose of the 1889 Universal Exposition?

Answer: to mark the centennial of the French Revolution

Question: Later interpretations of Avicenna's philosophy split into three different schools; those (such as al-Tusi) who continued to apply his philosophy as a system to interpret later political events and scientific advances; those (such as al-Razi) who considered Avicenna's theological works in isolation from his wider philosophical concerns; and those (such as al-Ghazali) who selectively used parts of his philosophy to support their own attempts to gain greater spiritual insights through a variety of mystical means. It was the theological interpretation championed by those such as al-Razi which eventually came to predominate in the madrasahs.
Is there an answer to this question: Who's philosophy was spilt into 4 different schools?

Answer:
unanswerable