The overall rate at which producers manufacture organic material is known as gross primary productivity (GPP). The rate at which producers keep organic material as fresh tissue is known as net primary productivity (NPP). What illustrates the connection between GPP and NPP?
- A$\text{NPP} = \text{GPP} \times \text{respiration}$
- B$\text{NPP} = \text{GPP} \div \text{respiration}$
- C$\text{NPP} = \text{GPP} + \text{respiration}$
- D$\text{NPP} = \text{GPP} - \text{respiration}$