(a) Common signs of sexual maturity in Boys-
i. Thickening of vocal cords due to which cracks in voice occurs.
ii. Initiation of sperm production.
Common signs of sexual maturity in Girls-
i. Shrillness invoice
ii. Initiation of ovulation and menstruation.
b) Decline in the Female to Male Sex Ratio; Gender Disbalance
c) Oral Contraceptive Pills(OCP)
d) The rate of birth and death in a given population determine s the size of a population.
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