Why are plastics non-biodegradable substances?

(N/A) Plastics are considered non-biodegradable because they are synthetic polymers composed of long,complex chains of molecules.
These chemical structures are highly stable and resistant to natural degradation processes.
Microorganisms,such as bacteria and fungi,lack the specific enzymes required to break down the strong carbon-carbon bonds in plastic molecules.
Consequently,plastics persist in the environment for hundreds of years without being decomposed by biological agents.