The two correct answers regarding the effects of burning fossil fuels on the atmosphere are:
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Increases levels of gases that retain the sun's heat - Burning fossil fuels releases greenhouse gases, such as carbon dioxide (CO2) and methane (CH4), which trap heat in the atmosphere and contribute to global warming.
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Increases levels of particulate matter - Burning fossil fuels generates particulate matter, which can lead to air pollution and various health issues.
The other options are not correct because burning fossil fuels does not improve air quality, and it does not increase the availability of sulfur dioxide in a way that would benefit plants. Instead, sulfur dioxide can contribute to acid rain and other environmental issues. Additionally, while ozone at ground level is a pollutant, its levels in the upper atmosphere can be influenced by various factors, but burning fossil fuels is primarily associated with increases in tropospheric ozone due to pollution.