What are three reasons some scientists think humankind began in east africa?

There's more than three reasons as to why some scientists think humankind originated in the African continent, some of them are:

- The closest relative to the humans, genetically speaking, is leaving in Africa, that's the chimpanzee.

- The oldest archeological findings of the transitional species of hominid, the Australopithecus, are found in Africa.

- The natural conditions for the needed evolutionary pressure were right in order for the development of the hominids.

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

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.