192504
Some scientists doubt that the impact was the sole cause , and others debate whether the Chicxulub impactor was one of several that may have struck the Earth at around the same time .
 Chicxulub
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chicxulub