Irritation Threshold is defined as the name applies. It is the threshold or maximum point at which an individual has become irritated or annoyed.
Answer: all cacti in the area.
Explanation:
Population is the total number of organisms of the same specie present in an given area.
Based on the given area (desert), all the cacti, best describes population.
Note that whenever different species (lizards, owl etc) are considered like in options B, C and D, you are referring to a community
Thus, all cacti in the area are considered as population.
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