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B
Pheromones present in urine, fur and dander
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C
Excreta
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D
Nail markings
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Solution
The correct option is C Pheromones present in urine, fur and dander A pheromone is a behaviour altering hormone which greatly affects the behaviour of the several animals in the vicinity. There are alarm pheromones, food trail pheromones, sex pheromones and many others that affect behaviour from prokaryotes to complex multicellular eukaryotes.