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"This is actually the third extinct plant that Mr Stroud has rediscovered and, for him, it is an ongoing and very personal mission. "There's never a time that I'm not actually looking fort these species because, we say they're extinct, but I believe they are there," he said. "It's so satisfying, bringing a plant back from the brink of extinction.""

"Seagrasses around the world are disappearing, with some species now threatened with extinction. The first global survey of individual seagrass species has found that 14% are at risk of going extinct."

According to a paper in PLoS Computational Biology, "PageRank" can be applied to the study of food webs.