The Chamorro people of Guam eat flying foxes, a type of bat, as part of their diet. The photograph shows a flying fox. (Source: © H Lansdown/Alamy Stock Photo) Scientists in Guam suggested there was a link between the diet of these people and the high incidence of the neuro-degenerative disease amyotrophic lateral sclerosis (ALS) in their population. In one investigation, scientists looked at the accumulation of the neurotoxin BMAA in the food chain of the Chamorro people. The table shows some of the data. Calculate the percentage increase in BMAA per gram from the seeds of the cycad trees to the flying foxes. Give your answer to two significant figures. (1) Answer .......................................................... \%

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