What comparison is made to help the reader of this passage better understand how materials are moved throughout the body? couldn't find science so I used history​

What did the french national assembly decide? peasants would only have to pay one-tenth of their earnings to the catholic church. the government could not legally charge taxes without first holding a vote. aristocrats would still receive special privileges as long as they paid a higher tax. employment would be available to all people, regardless of their social class.