L4A
28.1 Most eukatyotes are singles-celled organisms
28.2 Excavates include protists with modified mitochondria and protists with unique flagrlla
28.3 Chromalveolates may have originated by secondary endosymbiosis
28.4 Rhizarians are a diverse group  of protists defined by DNA similarities 
28.5 Red algae and green algae are the closest relatives of land plants 
28.6 Unikonts include protists that are closely related to fungi and animals 
28.7 Protists play key roles in ecological relationships