Can someone summarize this?

40pts

Following the end of the Civil War, the government passed amendments to grant civil rights to African-Americans. However, the failure of the reconstruction and discontent of southern states led them to pass the "Jim Crow" laws that enforced segregation. The injustice created a nonviolent movement by the African-Americans, and led by W.E.B Dubois, opposed Jim Crow. He started the National Assosication for the Advancement of Colored People(NAACP). The government started endorsing their stance and cases such as Brown v The Board of Education emerged, ending segregation in school. The Montgomery bus boycott and the leadership of Martin Luther King year later, finally the rights of all African-Americans were established by law.

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.