National parks can be a double-edged sword because

Because it attracts many people because of the conservation of naturaze, however the amount of people can cause some kind of degradation to nature that is being conserved in the national park.

Explanation:

In order to preserve large natural areas, their fauna and flora, the first National Parks appear in the late nineteenth century: natural areas, administered directly or indirectly by the State, intended for the conservation of their natural and cultural aspects for posterity. and as a representative symbol of a nation.

These parks, besides having a beautiful view, are the appropriate places to spend a relaxing time with family and friends, enjoying a conservation environment and pure and clean nature.

However, all this nature conservation can be a problem for national parks. This is because these parks attract many people and these people act incorrectly and degrade the nature that is being preserved there. The trash can leave trash in an inappropriate place, scare the animals, step on the grass, among other problems.

i think it is d. objects resist changes in their state of motion.