chlorophyta: large division of chiefly freshwater eukaryotic algae that possess chlorophyll a and b, store food as starch, and cellulose cell walls; classes Chlorophyceae, Ulvophyceae, and Charophyceae; obviously ancestral to land plants
abstraction: a general concept formed by extracting common features from specific examples
council of basel-ferrara-florence: the council in 1431-1439 that concentrated on the elimination of heresies and on reforms within the Roman Catholic Church