Need help asap!! When historians refer to "Prehistory", what are they talking about?

The era before humans populated the Earth

The era before the written word was invented

The era before agriculture was invented

The era before the traditional family unit was established

How did the mexican war of independence differ from the american revolution? o a. only the american revolution was concerned with establishing a representative form of government. o b. only the mexican war of independence required military conflict to achieve its objectives. o c. only the american revolution succeeded in replacing a monarchy with another form of government. o d. only the mexican war of independence eliminated spanish colonial control over part of north america.