Horseshoe crab blood is key to making a COVID-19 vaccine—but the ecosystem may suffer.

Conservationists worry the crustaceans, which are vital food sources for many species along the U.S. East Coast, will decline in number.
[Source: www.nationalgeographic.com] [ Comments ] [See why this is trending]
[Source: www.nationalgeographic.com] [ Comments ] [See why this is trending]
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