bodily functions:

 

    function = a formal occasion

    function = the specific role of an agent

    function = a relationship in which the variables determine each other

    body = the material structure of an organism

    body = an individual or group of individuals

    body = consistence

therefore,

an occasion in which something is formed by a consistent cluster of interdependent individual organisms performing their roles.
or a gang of breathers and sweaters (not pullovers):

jagna anderson | maría ferrara | dodi helschinger | nina selchow