Final answer:
The extremely large diversity of species in an ecosystem is directly responsible due to the interactions of both biotic and abiotic factors.
Step-by-step explanation:
The extremely large diversity of species in an ecosystem is directly responsible due to the interactions of both biotic and abiotic factors.
Biotic factors are the living components of the ecosystem, such as plants, animals, and microorganisms. They interact with each other through predation, competition, mutualism, and other ecological relationships.
Abiotic factors refer to the non-living components of the ecosystem, including temperature, sunlight, water, soil, and nutrients. These factors influence the availability of resources and habitats for different species. Therefore, the correct answer to the question is C) Both A and B.