Final answer:
Irena Sendler was not alone in her efforts; individuals like Raoul Wallenberg, Oskar Schindler, and members of the Polish Underground Resistance, including Jan Karski, also played crucial roles in saving Jewish lives during the Holocaust.
Step-by-step explanation:
Besides Irena Sendler's brave actions in rescuing Jewish children from the Warsaw Ghetto, several other individuals and groups played significant roles in helping Jews during the Holocaust. Raoul Wallenberg, a Swedish diplomat, created protective passports and organized safe houses in Budapest, which are estimated to have saved an equal number of Jews as were deported from Budapest to death camps.
Oskar Schindler, the famous industrialist, used his factory as a haven for Jews to prevent them from being sent to concentration camps, saving thousands. Additionally, the Polish Underground Resistance and figures like Jan Karski, who reported the atrocities, also contributed to the resistance and efforts to save Jewish lives.
Yad Vashem recognizes these individuals' heroic actions, and many are honored as the Righteous Among the Nations for their humanitarian efforts during the Holocaust.