2370
Although of limited sampling , our estimates support the extinction / repopulation hypothesis , which postulates recent diversification times for most hydrothermal vent species due to their mass extinction by global deep - water anoxic / dysoxic events during the Late Cretaceous and Early Tertiary .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None