Carlos made a study chart about changes to the environment that are caused by humans. Environmental Changes Caused by Humans X Y Results from introducing harmful substances into the environment Causes an increase in ultraviolet radiation that reaches Earth Results from the rising human population Causes the disappearance of many species in a short amount of time Which headings best complete the chart? X: Ozone Layer Destruction Y: Mass Extinction X: Long-Term Changes Y: Short-Term Changes X: Short-Term Changes Y: Long-Term Changes X: Mass Extinction Y: Ozone Layer Destruction