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

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 ecosystemHabitat coservation thus involves the preservation of ecosystem as ecosystem supports the needs of an organism for survival.