In a balanced ecosystem, the number of deer would be:
a) greater than the number of producers
b) less than the number of carnivores
c) equal to the number of scavengers
d) none of the above

Option D

Explanation:

In a balanced ecosystem, the flow of resource, food and energy must be adequate enough to fulfill the requirement of all.  

In case if the population of deer is higher than the population of producers then the producers would not be able to meet out the requirement of herbivore deer. Hence, this option is incorrect

In case if deer population is less than the population of carnivores, all the carnivores will not be able to get sufficient food. Hence, this option is also incorrect

Option C is also not feasible as equal number of scavengers will not be able to degrade the large biomass of dead animals and plants.  

Hence, option D is correct

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feral cats are estimated to eat tens of millions of native animals each night in australia