before_sent:  It is this upper sunlit ocean that creates the food supply that ultimately sustains most of the ocean ecosystem  . Light only penetrates to a  few hundred meters depth , so the remaining ocean below this is cold and dark.
before_sent_with_intent: <meaning-changed>  It is this upper sunlit ocean that creates the food supply that ultimately sustains most of the ocean ecosystem  . Light only penetrates to a  few hundred meters depth , so the remaining ocean below this is cold and dark.
after_sent:  It is this upper sunlit ocean that creates the food supply that ultimately sustains most of the ocean ecosystem since that is the origin of the food supply necessary to all life forms . Light only penetrates to a few hundred meters depth , so the remaining ocean below this is cold and dark.