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Ctenophores may balance marine ecosystems by preventing an over-abundance of copepods from eating all the phytoplankton ( planktonic plants ) , which are the dominant marine producers of organic matter from non-organic ingredients .
 plant: phytoplankton
Please list all entity words in the text that fit the category.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} 
Answer:
 plant: phytoplankton