What does the term "limiting factors " mean? name did examples for a jackrabbit in the desert.

In ecology, common limiting factor resources are environmental conditions that limit the growth, abundance, or distribution of an organism or a population of organisms in an ecosystem. ... Limiting factors may be physical or biological.

Its all about the organism and the living environment of the animal and it surroundings 

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem