Leon made a study chart about human-induced changes to the environment.

Environmental Changes Caused by Humans
X
Results from introducing harmful substances into the environment
Example: oil spill
Y
Results from natural areas being cleared and replaced by human development
Example: deforestation
Which headings best complete the chart?

1.X: Habitat Destruction
Y: Pollution
2.X: Long-Term Changes
Y: Short-Term Changes
3.X: Short-Term Changes
Y: Long-Term Changes
4.X: Pollution
Y: Habitat Destruction