Assertion: alkaloid's distribution | /r/CapableOf | suggest two alternative hypotheses
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text: The uneven distribution of tropane alkaloids in the angiosperms and the evolutionary distances between those families producing them suggest two alternative hypotheses: Either the ability to produce tropane alkaloids has arisen independently in multiple plant lineages, or the tropane alkaloid biosynthetic pathway was present in an ancestor basal to much of the angiosperms and was subsequently lost in most lineages.