Fill in the blanks

Human activities have altered many natural environments by _____. Many lands are now fields where only one from farm crop is grown, an example of a (n) ____.

Other human activities had added many ____ to the atmosphere some of which cause an ugly Haze called _____ or damage the protective ____. A consequence of global transportation has been the spread of _____ that outcompete or prey on native species.

Use these to fill in the blank:
Monoculture
Invasive species
Pollutants
Ozone layer
Smog
Deforestation​