1987
Using the number of earwax lamina deposited in the earplug and development of sexual organs from dead whales , Another method for determining age at sexual maturity , involves measurements of testosterone from the baleen of male blue whales .
 time: sexual maturity
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:
 time: sexual maturity