Bias.
A major cigarette company wouldn't want their sales to go down so they'd publish a <em>biased</em> study claiming there's no link between cigarettes and cancer.
Answer:
1. Abstain, Be faithful, or, as a last resort, use a Condom. Within a few years, Uganda had developed what researchers call a "social vaccine" against HIV: cultural norms about sexual responsibility, preached in clinics and public schools, as well as churches and mosques.
3.When used correctly every time you have sex, condoms are the best way to prevent sexually transmitted infections such as HIV. They have a very low failure rate and are effective for all forms of sex.
Answer: It provides the greatest detail of an image when light hits it
By containing all the instructions for it to carry out it's life. Hope this helps! :)
