Final answer:
Hemingway began his story with the information about the frozen leopard carcass on Mount Kilimanjaro to foreshadow the events in the story and symbolize the protagonist's mortality.
Step-by-step explanation:
Hemingway began his story with the information about the frozen carcass of a leopard on Mount Kilimanjaro to foreshadow the events in the story. The presence of the frozen leopard carcass symbolizes death and serves as a warning of the protagonist's mortality. This connects to the hyena that comes near the camp and the plane trip that Harry imagined, both of which represent threats and dangers that could lead to Harry's demise.