They also require routine maintenance and clean fuel. Tractors burn fossil fuels (some engines may run ok on biodiesel) and cause air pollution and waste products such as used oil and filters that must be properly disposed of to avoid contaminating ground water.
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[tex]1) \: Myocardium [/tex]
[tex]2) \: Parenchyma[/tex]
They also require routine maintenance and clean fuel. Tractors burn fossil fuels (some engines may run ok on biodiesel) and cause air pollution and waste products such as used oil and filters that must be properly disposed of to avoid contaminating ground water.
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