52. Which of the following correctly describes the relationships between gross primary production (GPP), net primary
production (NPP), autotrophic respiration (Ra), net ecosystem production (NEP) and total respiration of all organisms in
the ecosystem (Rt)?
(A) NPP = GPP - Rt (B) GPP = NPP - NEP (C) Rt + Ra + NPP = GPP
(D) NPP = GPP - Ra (E) GPP = NEP + Rh