അറ്റ പ്രൈമറി ഉൽപ്പാദനത്തിന്റെ കാര്യത്തിൽ ഇനിപ്പറയുന്ന ആവാസവ്യവസ്ഥകളിൽ ഏതാണ് ഏറ്റവും ഉൽപ്പാദനക്ഷമതയുള്ളത്?
Aമരുഭൂമികൾ
Bഉഷ്ണമേഖലാ മഴക്കാടുകൾ
Cസമുദ്രങ്ങൾ
Dഅഴിമുഖങ്ങൾ
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