premise: cutting down trees has a negative impact on an ecosystem / organisms living in an ecosystem sent2: using paper requires creating paper sent3: creating paper requires cutting down trees sent4: if something has a negative impact on something else then increasing the amount of that something has a negative impact on that something else sent5: if something is allowed to be used then the use of that something might increase sent6: paper is a kind of tool sent7: inventing a tool allows / enables that tool to be used sent8: if something requires something else then increasing that something requires an increase in that something else sent9: an impact means an effect.
hypothesis: an example of a living thing depending on another living thing to survive is a moose eating a plant