What is meant by the term "endangered species"?

The term "endangered species" refers specifically to a category of species that are at risk of extinction due to a variety of factors, which may include habitat loss, predation, pollution, climate change, and human activity. When a species is classified as endangered, it indicates a significant decline in population size or a restricted geographical range, making it vulnerable to further threats. This designation prompts conservation efforts aimed at protecting the species and its habitat to ensure its survival.

In contrast, the other options describe situations that do not align with the definition of endangered. For instance, a thriving species indicates a healthy population that is not at risk, while a stable population suggests that the species is in no immediate danger. Additionally, actively farmed species for conservation purposes are managed populations that do not face the same threats as those classified as endangered. Thus, the correct choice accurately encapsulates the meaning behind the term "endangered species."