A) skin colour
B) genitalia
C) breast
D) mutual behaviour of members of a species
Correct Answer: D
Solution :
Pheromones are chemical substances secreted by the exocrine glands and released into the external environment. They includes sex attractants exuded by females of same species. Synthetic form of pheromones are used in detection and control of insects pests. The oestrogen stimulates the development of secondary sexual characters in female during puberty. The skin colour depends on the presence or absence of melanin pigment.
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