Final answer:
National parks are important conservation areas that face threats from overcrowding and pollution. However, they remain protected from activities such as mining, logging, and grazing. Tourism, when well managed, can also help promote ecosystem conservation in national parks.
Step-by-step explanation:
National parks are an important part of our heritage and they remain pristine and undisturbed because of their park status. However, they are endangered by overcrowding, pollution, and in some places, mining. While national parks are protected from mining, logging, and grazing, they still face threats from activities such as overcrowding. Despite these challenges, national parks serve as important conservation areas and can promote ecosystem conservation through well-managed tourism.