Someone please answer this quickly i’ll be so grateful
If a terrestrial ecosystem has a gross primary production of 4,500 kcal/m?yr and a cellular respiration rate of 2.500 kcal/m2/yr, what is the net primary production for this ecosystem?
A) 200 kcalmyr
B) 250 kcalmyr
C) 2.000 kcalmly
D) O 7.000 kcalmy