In which climate zone is the diversity of plant and animal life the greatest?

The tropical climate zone is known for its high biodiversity among both plant and animal life. This zone typically features warm temperatures and abundant rainfall throughout the year, creating ideal conditions for a variety of ecosystems, including rainforests, wetlands, and coral reefs. The stable climate allows for continuous growth cycles and supports a vast array of species that have adapted to these environments.

In contrast, the temperate climate zone experiences more seasonal variations, which can limit the diversity of species capable of thriving there. While it does have rich ecosystems, particularly in forests, it doesn't match the sheer diversity found in tropical regions.

The arid climate zone is characterized by limited rainfall and harsh conditions, making it difficult for many species to survive. While some specialized flora and fauna are adapted to these environments, overall biodiversity is much lower than in tropical areas.

Lastly, the polar climate zone has extreme cold temperatures and long winters, which severely restrict the types of plants and animals that can inhabit these regions, leading to much lower biodiversity compared to tropical zones.

Thus, due to the warm climate, high precipitation, and stable environmental conditions, the tropical climate zone undeniably supports the greatest diversity of plant and animal life.