What is the relationship between the attractive force and the effective nuclear charge? (inverse or direct)

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

b.

the accuracy of the data.