In different times of history why have infectious disease epidemics appeared suddenly, killed many people, then faded out?

maybe because everybody who eventually got the disease died and the disease died with the people

Explanation:

Well they only last for a certain amount of times. Or they are only around for certain seasons on are only in certain areas. Like the flu you normally only see people get it during the winter, that's when it is at it's strongest. They start to fade out because people slowly start to build immunity on them or start to develop different ways to protect themselves.

Explanation:

Hope I helped:)

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.

i honestly have no idea