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(A) Chemical methods include the use of spermicides,which are substances that kill or immobilize sperm.Barrier methods are mechanical devices such as

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Increased contraceptive efficiency

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(A) Chemical methods include the use of spermicides,which are substances that kill or immobilize sperm.Barrier methods are mechanical devices such as diaphragms,cervical caps,and vaults that prevent the deposition of sperm into the vagina and their subsequent passage into the uterus.When these chemical methods are used in conjunction with barrier methods,they provide a dual layer of protection.This combination significantly reduces the failure rate of the contraceptive method,thereby leading to increased contraceptive efficiency.

Use of spermicidal creams,jellies and foams along with diaphragms,cervical caps and vaults leads to

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