Question

habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting
organism
population
ecosystem
species

Explanation:

Habitat preservation protects the entire ecosystem, which includes all organisms, populations, and species within it. An ecosystem encompasses the interactions between living (biotic) and non - living (abiotic) components. By preserving the habitat (the ecosystem), we are protecting the entire system that supports biodiversity, rather than just individual organisms, populations, or species. Preserving an organism or a population or a species alone is not as effective as preserving the ecosystem they belong to, as the ecosystem provides the necessary environment, resources, and interactions for their survival.

Answer:

ecosystem