How are gross production and net production different?
a. net production is always greater than gross production.
net production is always less than gross production.
only animals have net production.
only plants have net production,
select the best answer from the choices provided

The difference is that "Net production is always less than gross production".

Option (b);

EXPLANATION:  

Net production is the rate at which all plants, algae, bacteria produce net chemical energy in the useful ecosystem. The formula statement is that       Net Production = Gross Production - Respiration by plants.

Whereas, Gross production is the total sum of energy that is produced by the producer. It is the energy in that area in a given amount of time. Gross production doesn't include the energy that is lost in respiration. Thus the production value is less than gross production.

the answer to your question is b