Which natural organism is being used to create fully biodegradable packaging material called 'mycelium packaging' that decomposes within 45 days?

Sustainable packaging has seen remarkable innovations as brands seek to reduce environmental impact. Among these advancements, certain biological materials have gained prominence for their completely biodegradable properties and minimal ecological footprint. Test your knowledge about one of nature's most surprising contributions to eco-friendly product packaging that's revolutionizing how environmentally conscious brands deliver their goods.

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Mushroom mycelium (fungal root structure)
Kelp and seaweed fibers
Bacterial cellulose colonies
Hemp root systems