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These images of the Santa Cruz Rlver in Arlzona were taken In 1942 and 1989. During the perlod between theseyears, the growth of vegetation
declined substantlally in the area. What are the two most likely explanations for this change in vegetation?
1942
1989
O The amount of carbon dioxide in the alir slightly Increased.
O Herbivores (plant eaters) in the area migrated elsewhere.
O The roots could no longer access depleted groundwater.
O The region received a consistent amount of rainfall.
D The topsoll in the area eroded.
Answers: 2
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