These different ways of eating are all part of the same "response class".
Response Class refers to a group of responses of changing topography, all of which create a similar impact on the environment.
This implies the responses physically appear to be unique despite the fact that they have a similar impact on the earth. For instance when I wash my clothes I can wash the clothes with hand or I can put the clothes in the washing machine. In the two occurrences when I am done I will have washed the clothes and my clothes will be washed.