How did the atlantic slave trade affect societies within africa?

a. it spread deadly diseases such as smallpox throughout africa, devastating its population.
b. it allowed islamic kingdoms to conquer smaller african tribes and unify the continent.
c. it brought great wealth and technology to africa, leading to a golden age.
d. it forced millions of people from their homes and transported them around the world.

isaac newton first proposed that earth was not perfectly round. instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator.

the idea of the earth being a flat disc is also inconsistent with the fact that a given lunar eclipse is only visible from half of the earth at a time. the only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient greeks deduced that this must mean the earth is spherical.

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.