Which statement best describes a negative effect of human activity on Africa’s waterways? Dams have changed river flows, which has led to erosion.
The use of rivers to water crops has led to droughts.
Population growth has led to the destruction of rivers.
The use of river transportation has harmed water quality.

A:  Dams have changed river flows, which has led to erosion.

Explanation:

Dams stop the natural flow of a river.

This can lead to erosion and harm native plants and animals.

Humans make dams to control the water supply during the times of drought and flooding.

These quoted words came straight from my teacher and this is what I got for Edge 2020.

the following men who did not in the unification of italy were.

a) giuseppe mazzini

c) alexander ll

the other two men were camilo cavour and giuseppe garibaldi they the unification of italy by yielding territories in the italian unification. in 1861 italy was declared a united-nation state under the sardinian king victor immanuel ll.