Katniss doesn't kill Prim, Coin does. She does because she was afraid Katniss might want to stand up and be president.
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Katniss does (Katniss is Primrose's sister)
Her little sisters name is Primrose Everdeen but Katniss calls her Prim.
Katniss said their alike because of their smaller size
The Rebels decide to rescue Peeta in Mockingjay because without Peeta they won't have Katniss's help. Katniss is severely depressed with him in the Capitol's hands and she can't think straight while Peeta is with them. That is the only reason why they rescued Peeta. Not because they care about him. They only cared about Katniss because she is the Mockingjay.
In the hunger games what is true about a bird called jabberjay