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 || results from the rising human population
harmful substances into || causes the disappearance of many species in a short
the environment || amount of time
causes an increase in ||
ultraviolet radiation that
reaches earth
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