Biology

The correct answer is D.Prey availability.

Prey availability is a biotic factor because it involves living organisms (prey) in the ecosystem. The presence and abundance of prey can influence the survival and behavior of predators, making it a key biotic factor in the ecosystem.

The other options are abiotic factors, as they refer to non-living components of the environment:

A.Sunlight is an abiotic factor that provides energy for photosynthesis and affects the climate and growth of plants.