geography: The largest city on the Mississippi River is -----------------?

Questions

what were more than 99.9% of all the animal species that have ever lived on earth before the coming of man?

10' of what equals 1' of rain in water content?

where was the greatest snowfall ever recorded in a single storm?

where was the first speed limit regulation of 20 mph set?

the first speed limit was set in 1903, 1906 or 1909?