Answer:
Lauren Olamina helps an old man retrieve his cane and gets a smile from a black man pushing a cart. Harry finds money someone has dropped, and the group decides to buy another gun. Zahra suggests the group scavenge a burning house, but Lauren urges the group forward. The group members hear gunfire behind them.
Explanation:
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The political group which took the view of Reconstruction that harsh penalties needed to be doled out to former Confederates while giving full rights to Freedmen was called Radical Republicans. Radical Republicans were famous due to their strong will of putting an end to slavery and secession. During Reconstruction, they also opposed opposed Lincoln's ideas of reuniting the United States and giving powers to Confederacy.
I believe it's the last one "<span>Scientists studied the trapping of gases in the atmosphere."</span>