Which set of factors are primary drivers of biodiversity loss?

• A. Habitat destruction, fragmentation, invasive species, pollution, and climate change.
• B. Biodiversity loss is caused only by climate change.
• C. Connectivity is unnecessary in conservation.
• D. Ex-situ conservation is the only strategy needed.

Answer: (A)

Biodiversity loss comes from a suite of human-caused pressures that degrade habitats and disrupt how ecosystems work. The main drivers are habitat destruction and fragmentation, which reduce and split the space species need to live, feed, and reproduce. When habitats are broken into smaller patches, populations become isolated and more vulnerable to extinction. Invasive species can invade these disturbed or depleted systems and outcompete, prey on, or bring diseases to native species, often altering entire food webs. Pollution harms organisms directly and degrades the quality of air, water, and soil that ecosystems depend on. Climate change adds stress by shifting climate zones, changing seasonal patterns, and increasing extreme events, which can push species beyond their limits or mismatch them with their food sources and habitats. Together, these factors interact and compound each other, making them the primary set of drivers behind biodiversity loss.

Other options don’t fit as well because climate change acts in combination with the others rather than alone, connectivity is actually crucial for resilience and persistence of species, and ex-situ conservation is a valuable tool but not the only strategy needed to protect biodiversity in natural ecosystems.