Name two reasons that a large national park like serengeti or yellowstone might not be enough to effectively conserve apopulation of a threatened species. what solutions exist to address these reasons?

The act of practising illegal poaching (illegal killing or hunting of wide animals)

and rapid human settlements

are the major reasons while these parks may not be effective conservation  system.

Solutions

1 Wildlife guards should be  well constituted to enforce strict measures against  poaching,

through round the clock patrols,

use of firearms,

and to improve vigilance with the use of sophisticated monitoring equipment E.g   DRONES.

Barricades to separate theses Parks from residences should be  erected to cut out human encroachments from the park

Governments should  resettle  the concerned citizens on available portion of land far away from the park.

Populace should be well educated on the need to protect nature rather than destroying it.Public enlightenment programmes should be organized for the masses.

Explanation:

it would lead to upper respiratory infections and pneumonia.