Chemistry, asked by b4lapradd, 2 days ago

Select all the correct answers.
These images of the Santa Cruz River in Arizona were taken in 1942 and 1989. During the period between these years, the growth of vegetation declined substantially in the area. What are the two most likely explanations for this change in vegetation?

1.The amount of carbon dioxide in the air slightly increased.
2.Herbivores (plant eaters) in the area migrated elsewhere.
3.The roots could no longer access depleted groundwater.
4.The region received a consistent amount of rainfall.
5.The topsoil in the area eroded.

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Answers

Answered by Harshshahi19

Answer:

The roots could no longer access depleted groundwater

The topsoil in the area eroded

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Answered by Afreenakbar

Answer:

Two most likely explanation :-

3.The roots could no longer access depleted groundwater.

5.The top soil in the area eroded.

Explanation:

The two most likely explanations for the decline in vegetation growth in the Santa Cruz River area between 1942 and 1989 are:

3.The roots could no longer access depleted groundwater: Overuse of groundwater for agricultural and urban purposes in the area could have led to a decline in the water table, making it difficult for plant roots to access water.

5. The top soil in the area eroded: Erosion can remove the nutrient-rich topsoil layer, making it difficult for plants to grow. This can be caused by factors such as overgrazing, deforestation, or unsustainable farming practices.

Although a rise in carbon dioxide levels may have some impact on plant growth, it is unlikely that this impact was large enough to account for the period's sharp fall in vegetative growth.

Similarly, while herbivore migration might have an impact on how vegetation is distributed, it is unlikely to have led to a drop in plant growth as a whole. The Santa Cruz River basin is a desert region with low rainfall levels, therefore the consistent amount of rain is unlikely to have played a substantial role in the reduction.