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Mystery #4Tier 2-3plants / poison

Why are some pretty berries deadly poison to eat?

Some of the prettiest berries in the hedgerow are deadly. A few shiny black or bright red beads can make an animal, or a person, dangerously ill. The plant spent real energy filling those berries with poison. So what on earth does a plant gain by growing fruit that hurts whoever eats it?

Bright red yew berries nestled among the dark green needles of a yew branch, each with a dark seed inside.
Photo: Bob Harvey · CC BY-SA 2.0 · via Wikimedia Commons

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What could a plant possibly gain by making its berries poisonous?

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