I think it is A . eubacteria
Answer is c. If one essential nutrient within an ecosystem runs out, primary productivity will be limited
According to Vitousek et al., 2010, nutrient limitation defined as meaningful additions of an essential element in biologically available forms which increases the rate of primary productivity or increase in the biomass in an ecosystem. Alternately, nutrient limitation may also explained as when the supply of one essential nutrient of the ecosystem runs out the primary productivity of the plants will be limited.
The correct answer is option glucose.
The glucose can be used as the immediate source of the energy. The cells can utilize the glucose to form the ATP molecules, which can be used as a source of energy by the body of the organism. The cellulose, chitin, and the glycogen are the polymers, they can only be utilized, once they are broken down into simpler forms.
