Question

Also they are non biodegradable and are made of very harmful plastic which can never deplete.

Answer 1

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Biodegradation: Microorganisms at Work

When something is biodegradable, soil, air or moisture decompose it so that it becomes part of the land. Bacteria, fungi and other decomposers break down dead organisms in a natural process that keeps dead material from covering the planet. While most biodegradable substances consist of animal or plant material, humans can create products that decompose, such as egg cartons and paper bags. If a company produces biodegradable plastic, decomposers break down the plastic's complex organic molecules into simpler inorganic compounds. In May of 2014, Stanford University scientists and Mango Materials teamed up to develop a biodegradable plastic made from waste methane gas.

Effects on Marine Life

Non-biodegradable plastic containers in oceans and estuaries can harm fish, seabirds and other marine life. Animals that eat plastic can strangle or experience digestion problems. Microplastics, tiny bits of polypropylene or polyethylene, hide beneath the water and pose a risk as well. As of September 2014, Virginia Institute of Marine Science researchers were developing biodegradable microbeads that break down when microbes in seawater consume them.