Final answer:
The item 'D: Introducing invasive species will decrease biodiversity by displacing native species' is NOT a pillar of the North American model of wildlife conservation. This model includes principles such as eliminating markets for wildlife, adhering to the Public Trust Doctrine, following science-based wildlife policy, and protecting wildlife habitat.
Step-by-step explanation:
The North American model of wildlife conservation is built upon several key principles or 'pillars'. These include the Elimination of markets for wildlife, which discourages illegal trade and promotes species conservation by removing economic incentives for poaching. Another principle is the Public Trust Doctrine, establishing that wildlife resources are held in trust for the public by the government. Science-based wildlife policy is also a pillar, ensuring that decisions regarding wildlife management are guided by rigorous scientific research. Finally, the Protection of wildlife habitat is fundamental, as conservation is greatly determined by the availability and quality of habitats. Therefore, the item that is NOT a principle of the North American model of wildlife conservation is D: Introducing invasive species will decrease biodiversity by displacing native species. Introducing invasive species is not a conservation practice; it's an issue that conservation efforts often aim to combat due to its harmful impacts on ecosystems.