If herbivores eat 320 kg of plants, and the total plant biomass is 1,600 kg, the efficiency is %.

The total plant biomass ( 1,600 kg ) represents 100 % and 320 kg represents x %. Then:
1,600 : 320 = 100 : x
or:  1600/320 = 100/x
When we cross multiply:  1,600 x = 32,000
x = 32,000 : 1,600
x = 20 %
c ) consumption, 20 %.

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