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.

Einar sees alexandra every day across the room in his history class but has never talked with her. einar likes the way alexandra looks, including the way she dresses and how she wears her hair. he's even more attracted to her apparent intelligence and the way she handles herself in class discussions and during interactions with the instructor. he'd like to know more about her, so he asks one of his friends about her. einar, using a passive strategy to gain information about her, is probably in the preinteraction awareness stage of any relationship that might develop between them. t/f