The 9/11 attacks on the world trade center, princess diana's death, and the 1986 challenger explosion. people's memories for the moment in which they learned of these events are termed memories.

europeans, particularly with the first conquistadores of the iberian explorations, was to insert into the american biosphere new diseases, such as smallpox, measles, etc, that the native americans had no resistance to (unlike eurasians and africans, who by natural selection if nothing else, had developed some genetic resistance to those diseases).

explanation: