Habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting an entire

organism

population

ecosystem

species

The answer is Ecosystem

Habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting an entire Ecosystem.

Explanation:

Habitat of an organism is the area where it can survive and grow. When we preserve an habitat, we not only preserve the particular organism but we protect the plants a, other animals and decomposers in that area. Thus we are actually conserving the biodiversity. Habitat conservation involves maintaining proper balance between the biotic and abiotic factors of the region thus maintains the balance of the ecosystem Habitat coservation thus involves the preservation of ecosystem as ecosystem supports the needs of an organism for survival.