Which of the following is an example of how people modify the environment in Africa? i. cutting down trees in order to plant crops or build homes ii. building a dam on a river iii. allowing herd animals to graze on native grasses

People modify the environment when they change its natural features or how land and water are used. Cutting down trees to plant crops or build homes changes the landscape, and building a dam alters a river. Allowing herd animals to graze on native grasses also affects the vegetation. Therefore, all three are examples, so the best answer is “i., ii., and iii.”

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