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The " rivet-popper " hypothesis put forth by Paul R. Ehrlich and his wife Anne H. Ehrlich , compares each species forming part of an ecosystem as a rivet on the aeroplane ( represented by the ecosystem ) .
 person: Paul R. Ehrlich; person: Anne H. Ehrlich
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Paul R. Ehrlich, Anne H. Ehrlich 
Answer:
 person: Paul R. Ehrlich; person: Anne H. Ehrlich