Here's why:

* Abiotic factors are non-living components of an ecosystem. They include things like:

* Water

* Air

* Sunlight

* Rocks

* Soil

* Biotic factors are living organisms or their products. They include things like:

* Plants

* Animals

* Bacteria

* Fungi

Plastic is a synthetic material produced by humans. It does not have the characteristics of living organisms, such as growth, reproduction, or metabolism.