Why was sub saharan africa so far behind technologically

Explanation:

They have not fully developed yet. It doesnt help that their population grows larger in less than a year. They may not be able to afford such technologys because they are fulfilling the needs of their people.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.