Final answer:
The central idea is developed by showing the impact of human actions on wildlife, discussing conservation strategies like corridors and national parks, and involving local communities in protecting species like elephants and cougars.
Step-by-step explanation:
The central idea in the provided excerpts is developed by highlighting the negative consequences of human actions on wildlife and the ecosystem, and by outlining various conservation strategies aimed to protect these species. For example, the establishment of conservation corridors and national parks are mentioned as measures to preserve biodiversity and prevent poaching.
In the case of cougars, the decline in their population in Utah led to an overabundance of deer which then affected local streams and biodiversity. Similarly, the loss of lions and leopards in Africa has resulted in a rise in olive baboons and associated health issues for humans. The paragraphs also discuss the impact of industrial whaling on killer whale diets and subsequent effects on other marine species.
The Olympic Cougar Project and the Wildlands Project strive to make large-scale changes to protect these ecosystems and the species within them through corridor connection and habitat preservation. Additionally, considerations regarding how to best protect African elephants highlight the importance of involving local communities and providing incentives for conservation through tourism.