Multiple prey means that all essential vitamins and amino acids are consumed and means that if one food source becomes extinct, the predator does not also die out
Pyramid of Numbers - count all of the organisms in the area
Pyramid of Energy - Burn all the organisms in a bomb calorimeter to heat water and work out the energy released per gram
Pryamid of Biomass - collect the organisms and heat 80dc so that all the water evaporates, weigh the dry mass on a calibrated balance
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