Does the sentence "However, when they ceased to pay tribute after Genghis Khan's death, his successor Ogedei Khan (r. 12291241) launched an invasion into Tibet." provide a valid answer to the question "Who was Genghis Khan's successor?"

A: yes

Does the sentence "With Woyciechowski, he headed for Austria, intending to go on to Italy." provide a valid answer to the question "Which country did Frederic go to first after setting out for Western Europe?"

A: yes

Does the sentence "Inside the pump, a mechanism expands a small sealed cavity to create a vacuum." provide a valid answer to the question "Why is fluid in a manual pump pushed into the pumps cavity when a small sealed cavity is expanded?"

A: no

Does the sentence "The Luftwaffe was not pressured into ground support operations because of pressure from the army, or because it was led by ex-army personnel." provide a valid answer to the question "Who took over for Wever after his death?"

A:
no