The CO2 flux towers can not measure net primary production (NPP) because they cannot measure O₂ levels and therefore cannot estimate NPP. Option A
The CO2 flux towers have the responsibility to collect the data from across the globe on the rate of exchange of carbon dioxide between the the earth and atmosphere.
The CO₂ flux towers can be used to measure terrestrial net
ecosystem production (NEP) and gross primary production (GPP)
but not net primary production (NPP) because they cannot measure O₂ levels and therefore cannot estimate NPP.
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