Question

national parks do a great job of protecting species. what else is carefully protected in a national park? natural habitat for all species parcels of land to be sold fences between different areas parking areas to ensure visitors

Explanation:

National Parks aim to protect the natural environment. The natural habitat for all species is a key element they safeguard. Parcels of land to be sold (contradicts protection), fences between different areas (not the main protection focus), and parking areas (for visitor convenience, not core protection) are less relevant.

Answer:

natural habitat for all species