A woman who is trying to conceive ovulates on day 12 of her monthly menstrual cycle. An ovum can live for up to 24 hours
after it is released, Sperm can live for about three days after entering the female reproductive tract. On which days of the
woman's menstrual cycle would sexual intercourse be most effective in achieving conception?
days 8, 9, and 10
days 11, 12, and 13
days 12, 13, and 14
days 13, 14, and 15

Lyme disease is caused by a bacterium transmitted to people by deer ticks. deer ticks are almost never born infected with the bacterium, but they can pick it up from feeding on an infected host in any of the tick's three successive stage of development: larva, nymph, adult. once infected, a tick remains infected through any subsequent developmental stages, but since a tick feeds on only one host in each stage, it follows that . people can be infected only by being bitten by a tick that is either in larval stage or in the nymph stage b. people cannot be infected by a tick that picked up the lyme disease bacterium in the adult stage c. it is not possible for a person to be infected by a tick that is in the nymph stage or by a tick that was infected with the bacterium while in the nymph stage d. people infected with the lyme disease bacterium cannot transmit bacterium to adult deer ticks e. only deer ticks that are adults can transmit the lyme disease bacterium to people