22265
Summary statistics such as means and variances can be recorded in place of the full ensemble , allowing for a reduction in the amount of memory used - an important consideration for models including large numbers of individual subpopulations or demes .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None