Disposable plastic plates should not be used because :
(a) they are made of light weight materials
(b) they are made of toxic materials
(c) they are made of biodegradable materials
(d) they are made of non-biodegradable materials
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Solution
(d) they are made of non-biodegradable materials
Disposable plastic plates cannot be degraded by micro-organisms and hence should not be used. They will remain as such in the environment and pollute it.