What evidence exists of a migration in ancient africa?
a. many pyramids in sub-saharan africa
b. the existence of many related languages
c. ancient writings about migration
d. eygyptian temples in equatorial africa

The correct answer is B. The existence of many related languages

Explanation:

Migration is the process in which a group of people leaves the place where they live and move to another mainly with the purpose of settling for some time or permanently. On the other hand, Migration in Ancient Africa refers to the process in which humans that had originated in African  territories left the continent around 60000 years ago, in this way this process of migration led to humans migrating to different continents and to an important diversification of the species with new physical features that were linked to each environment.

Additionally, this common origin implies features of all humans are shared despite of the years passed, one of these features that supports this theory is that many languages are related languages, this can be explained as small populations in different continents with its own language led to bigger and spread populations whose language was different to the original language but still shared some features, in this way a set of languages descended from a common language that originated in Africa and these set of language also give origin to new languages and to the languages that we know today. For this reason, even when languages are different they share common ancestors and because of this modern language can be grouped in families, which supports humans originated in Africa and then spread to other continents as if they did not have a common origin, languages would not share common features.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation:

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69