79551
Some of the major fields of study within aquatic sciences include : limnology ( study of lakes , rivers , wetlands and groundwater ) ; biogeochemistry ; aquatic ecology ; oceanography ; marine biology ; and hydrology .
 marine biology
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 marine biology