Answer:
Genetic drift is the change or mutation in the gene pool over generations. It can take several generations for a genetic drift to take place in a community. But if the population of that generation is smaller, there are higher chances that the genetic drift would occur over the next very generations. Any mutilations that disrupts the natural course of genetic transfer can cause genetic drift to take place in those species.
Jelly Roll Morton was a brilliant solo pianist and also an prominent bandleader. He developed ragtime and instrumental blues into a new ensemble style which embraced collective polyphony, solo improvisations, and ever-changing textures and timbres.
Morton's piano style revolutionized jazz by adding sharp notes, flat notes, different sounding 5th and 6th of notes. He spread his influence by roaming around world and later by on recording. Jelly roll introduced new ways in jazz. He helped in showing the way to African American musicians and singers in recording industry.
Whereas, The Harlem Stride was a jazz piano style that emerged in large cities of the East Coast. It is regarded as the first step taken beyond ragtime that brought improvisation and rhythmic enjoyment to the living rooms, nightclubs and Harlem.
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Answer:
1. It caused economic hardship in the empire
2. Magellan sailed east around Africa to reach the Pacific Ocean.
3. Europe
4. astrolabe
New england i believe (in 1623)