Question

primary productivity is not limited by _. a. the availability of sunlight b. time c. the availability of nutrients d. access to water

Explanation:

Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances. Sunlight is needed for photosynthesis (in most autotrophs), nutrients are essential for growth and metabolism of autotrophs, and water is a reactant in photosynthesis (for photo - autotrophs). Time is a measure of the duration of a process but is not a limiting factor in the sense of being a resource that can be depleted or in short supply for the process of primary productivity.

Answer:

B. time