Question

why are some substances biodegradable and some non _biodegradable​

Answer 1

It is because all substances are made up of ATOMS AND MOLECULES.
but they are made from different kinds of ATOMS AND MOLECULES.

And

They were created by NATURE.

THANKS

Answer 2

Question:

• why are some substances biodegradable and some non- biodegradable ?

Answer:

Such Substance that are broken down by biological process and microorganisms is termed as biodegradable and such substances that are not broken down by biological process and microorganisms. These wastes persists in the environment and are termed as non - biodegradable .

Example of Biodegradable substances

• Sewage ,
• wood ,
• paper ,
• domestic wastes products
• urine and faecal matters , etc.

Example of Non - Biodegradable substances

• Glass
• Plastics
• Aluminium
• Polythene bags , etc .