3. Explain how the role (niche) of the wolves and their disappearance from Yellowstone was connected to the decline of Aspen trees.

The decline of aspen trees in Yellowstone was mainly caused by elk because they eat young aspen trees. Wolves eat elk, which helped control the elk population and create areas where elks were absent (where wolves resided).

less wolves -> more elk -> less aspen trees

thermophiles, notice the prefix thermo.

the correct option is option d