Answer:
The answer is: Treetopplers's wood production is not included in the GDP
Step-by-step explanation:
The GDP includes all the domestic production of final and legal goods and services.
The value of final goods is included, but not the parts that go into them (intermediate goods). In this case, the wood Treetopplers produce is used by other companies (e.g. Buildit and Partners) to build final goods such as new houses. So the wood is an intermediate good.