Leon made a study chart about human-induced changes to the environment. Environmental Changes Caused by HumansXYResults from introducing harmful substances into the environmentExample: oil spillResults from natural areas being cleared and replaced by human developmentExample: deforestation

Introducing harmful substances such as oil into the environment is pollution, so X is Pollution. Clearing natural areas and replacing them with human development destroys habitats, so Y is Habitat Destruction. Therefore, choice D matches both descriptions.

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