Which of the following is an important purpose of national parks and wildlife refuges?
to restrict oil drilling to specific areas
to set aside land for deforestation
to protect landscapes and endangered species
to protect the ecosystem from the effects of industrial fishing

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.