Artificial methods in common use include preventing the sperm from reaching the ovum (using condoms, diaphragms, etc), inhibiting ovulation (using oral contraceptive pills), preventing implantation (using intrauterine devices), killing the sperm (using spermicides)
A) Lower life expectancy
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<u>d) observing how the heart contracts to pump blood
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All STDs have readily visible symptoms that are easy to detect.
