Which of these successful products was developed by studying and mimicking the unique structure of lotus leaves?

Product designers increasingly look to nature for sustainable and efficient solutions—a practice called biomimicry. From Velcro (inspired by burrs) to bullet trains (kingfisher beaks), the natural world provides remarkable templates for human innovation. This trivia tests your knowledge of how product designers have successfully adapted nature's time-tested strategies to create revolutionary consumer products. Can you identify which famous nature-inspired product design transformed its industry?

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Self-cleaning paint and glass coatings that repel water and dirt
Biodegradable packaging material that expands when exposed to water
Flexible solar panels that rotate to follow the sun's movement
Breathable fabrics that regulate temperature by opening and closing microscopic pores