371565
There are at least 956 nominal species of gastropods , which breaks down to about 250 species of freshwater gastropod s , and about 700 species of land gastropods ( 590 species of snail s and approximately 110 ( ? )
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None