Which terrestrial biomes has the highest primary productivity per unit area?

Tropical rainforest

Explanation:

Primary productivity refers to the productivity or the amount of the biomass and energy produced by the primary producers or the autotrophic organisms especially green plants.

The primary productivity is dependent on many factors like the temperature, rainfall and many other factors which could influence the productivity and since the rainfall, sunlight, the temperature is suitable for the growth in the tropical rainforest, therefore, the rainforest posses maximum plant genetic diversity.

The primary productivity, therefore, is the highest of the tropical rainforest which is estimated about 2,200 grams of biomass per square meter per year.

Thus, Tropical rainforest is correct

the answer is c a tornado