In order for a physical barrier to be effective in preventing infection, the barrier must
a.
prevent the substance from entering the body, trap the substance when it first enters the body, or flush the substance out of the body
b.
destroy the substance before it enters the body, prevent the substance from reproducing, or flush the substance out of the body
c.
trap the substance in the body, remove the substance from the body, or prevent the substance from reproducing
d.
flush the substance from the body, transport the substance in the body, or destroy the substance in the body

Jessica said she would never work for less than $12 an hour, but then she got a job looking after children in the afternoon, and it pays only $6 an hour. now she says that money isn't as important as enjoying her work. this is an example of: apex

Lifestyle diseases are caused by a combination of

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