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

Correct answer choice is:

B. Time

Explanation:

Primary productivity is a phrase applied to define the frequency at which plants and other photosynthetic bodies generate natural compounds in an ecosystem.

There are two features of primary productivity:

Gross primary production is the entire quantity of organic substance manufactured in a given time, whereas net primary production is the quantity of organic substance produced in abundance of that practiced in respiration.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia