Which of the following forest management practices is the most harmful to forest ecosystems?
a. clearcutting
b. shelterwood cutting
c. group selection
d. single tree selection

There are a lot of forest management practice that cause harm to the forest ecosystems. On of the most harmful is Clearcutting. Also known as clearfelling, in this forestry almost or all of the trees are cut down. It is synonymous to deforestation. It destroys natural habitats.

Clear cutting is very harmful to forest management

Normally you would just say a power source, but in most instances you would use a battery.