Does anyone know this?

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

Plz answer meh question it"s due in 5 what were the israelites known for that made them unique among ancient peoples?

What notable contributions to science has sandia national labs (snl) produced over the years?