The repeat unit of polymethylacrylate is, 
Definitions:
Non-renewable Resources
Natural resources that cannot be replenished within a human lifespan, including fossil fuels and minerals.
Natural Gas
A fossil fuel consisting mainly of methane, used as an energy source for heating, electricity generation, and as fuel for vehicles.
Acid Rain
Precipitation that is significantly more acidic than normal due to atmospheric pollution, leading to harmful effects on the environment and structures.
Ecological Footprint
A metric that quantifies the amount of nature's resources an individual, community or activity consumes relative to the Earth's capacity to regenerate those resources.
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