What the question gives "some organisms the chamber of a gull's wing, or butterflies that cannot be seen in the ground litter." I am supposed to figure out whether the word litter is an example of an assuring term, an argument marker, a guarding term, a discounting term, a negative evaluative term, a positive evaluative term, a rhetorical device, or none of the above. I think it's none of the above, but I'm not sure.
Please give a full explanation.