Aphids can feed in the leafy treetops (or tree canopies). Ants are usually not abundant in the tree canopies unless aphids are also present. You introduce aphids to an area of the tree canopy and survey the abundance of ants over time. Finally, you take a tree and block the ants from the canopy. Then you spend three years counting the number and types of insects on the forest floor around this tree (tree A) and in the area around a tree in which ants are not blocked (tree B). You find that the area around tree A has 25% fewer ants and 40% more beetles than the area around tree B. These data support the hypothesis that: a. ecological interactions in the tree canopy always have a negative effect on forest floor communities. b. there is no relationship between ant abundance and beetle abundance. c. there is a negative relationship between ant abundance and beetle abundance. d. ecological interactions in the tree canopy have no effect on forest floor communities. e. Othere is a positive relationship between ant abundance and beetle abundance.