Why did some paleolithic people in east africa migrate to other areas between 100,000 and 75,000 years ago?

a. rival groups drove them out
b. farmland became increasingly scarce
c. the climate became very unstable

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.

ha deadpool ofc

explanation: