Which biomaterial has scientists recently developed into a fully biodegradable packaging foam that can replace petroleum-based styrofoam in scientific equipment shipping?

In today's environmentally conscious world, the scientific community has been pioneering innovative sustainable packaging solutions that minimize environmental impact while maintaining product integrity. Many of these breakthroughs rely on advanced materials science and biochemistry. This trivia question tests your knowledge about a groundbreaking packaging innovation that's changing how scientific products are shipped and stored.

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Mycelium (fungal root structures)
Graphene-reinforced cellulose
Algae-derived polyhydroxyalkanoates (PHAs)
Bacterial nanocellulose composites