Question

Internal recycling
External recycling
Biodegradable waste
Non-biodegradable waste​

Answer 1

There are two broad types of recycling operations: internal and external. Internal recycling is the reuse in a manufacturing process of materials that are a waste product of that process. ... External recycling is the reclaiming of materials from a product that has been worn out or rendered obsolete.

A biodegradable substance can be defined as a material which can be decomposed by microorganisms or decomposers and not be adding to any type of pollution. Waste that cannot be decomposed by the biological ways is called the Non-biodegradable wastes.