The "Net Primary Productivity" Is

Multiple Choice

The "net primary productivity" is:

A) The amount of energy used in metabolism by producers
B) The amount of energy given off as heat by producers
C) The amount of energy trapped by the autotrophs of an ecosystem
D) The amount of energy available for consumers
E) Both amount of energy given off as heat by producers and amount of energy trapped by the autotrophs of an ecosystem are correct