How many states joined the confederate states of america?

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

Which major change took place in nigeria in 1999?

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste