ഒരു ഭൗമ ആവാസവ്യവസ്ഥയുടെ പ്രാഥമിക ഉൽപാദനക്ഷമതയുടെ എത്രത്തോളം സസ്യഭുക്കുകൾ ഭക്ഷിക്കുകയും ദഹിപ്പിക്കുകയും ചെയ്യുന്നു?
A1%
B10%
C40%
D90%.
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