Early farmers made several changes to their environment, and among the options provided, all four responses represent significant alterations:
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They created terraced farming - This technique involves shaping the landscape into steps to prevent soil erosion and manage water efficiently.
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They burned undergrowth - This method, known as slash-and-burn agriculture, is used to clear land for cultivation and enrich the soil.
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They planted orchards - This is the establishment of fruit-bearing trees, altering the landscape for agricultural production.
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They built dams - This involves constructing barriers to control water flow for irrigation and to manage water resources effectively.
Any one of these responses could correctly illustrate a change made by early farmers, depending on the specific context you are considering.