Sub-saharan africa's population growth is

1.decreasing
2.negative
3.positive
4.stagnant

3.positive

Explanation:

According to new researches the population of the  subsaharan african region is incerasing and will be the region that will increase the most its population, doubling its population in the next 20 years, from 1.1 nbillion to 2.4 billion in 2050 approximately. This means that the population growth is positive.

answer; obscene;