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The immune cells that fight bacteria and viruses are well-known. But some scientists think we should devote more attention to a second prong of defense: one that allows our bodies to more harmlessly live with pathogens until they’re cleared from our systems.
Lots of them depend on fruit-eating birds and mammals to spread their seeds. But it’s debatable whether the animals — many in trouble themselves — can disperse seeds far and fast enough to keep pace with a warming world.
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