Carlos made a study chart about changes to the environment that are caused by humans. Environmental Changes Caused by HumansXYResults from introducing harmful substances into the environmentCauses an increase in ultraviolet radiation that reaches Earth Results from the rising human populationCauses the disappearance of many species in a short amount of time

Introducing harmful substances such as chlorofluorocarbons can destroy the ozone layer, allowing more ultraviolet radiation to reach Earth. Human population growth can increase pressure on habitats and resources, contributing to the rapid disappearance of many species, called a mass extinction. Therefore, X is ozone layer destruction and Y is mass extinction.

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