Tech || Science Facts || How it works on Instagram: "This ancient animal saves millions of human lives every year. The horseshoe crab may look prehistoric, but its blood plays a critical role in modern medicine. This species has survived for more than 450 million years, remaining almost unchanged while countless other life forms disappeared. Unlike humans, its blood is bright blue because it uses copper-based hemocyanin instead of iron to carry oxygen. What makes it medically priceless is its im

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