Thermosetting plastics cannot be used again. why

Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. ... Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. An excellent example is polyurethane foam

Explanation:

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

a symbiotic relationship with the mitochondria