What is the significance of biodiversity in ecosystems?

Biodiversity plays a crucial role in enhancing both the resilience and productivity of ecosystems. High biodiversity ensures a variety of species are present, which leads to a wider array of interactions and relationships within an ecosystem. This variety allows ecosystems to better withstand disturbances, such as diseases, climate change, or human impacts, because some species can fill in roles left vacant by those affected.

Additionally, a diverse range of species contributes to ecosystem productivity by enabling efficient resource use. For example, different plants can utilize sunlight, water, and nutrients in complementary ways, leading to higher overall biomass and greater food availability. Higher biodiversity also promotes genetic variety within species, which can enhance their adaptability to changing conditions.

In contrast, the other choices do not accurately reflect the benefits of biodiversity. While reducing competition may occur in some contexts, it is not a defining factor of biodiversity's significance. Simplifying ecological interactions is counterproductive, as complex interactions contribute to ecosystem health. Limiting the number of organisms in a habitat contradicts the very essence of biodiversity as it encourages a greater variety of life. Thus, the correct answer captures the essential role of biodiversity in maintaining healthy, functioning ecosystems.