What is the main function of the respiratory system?
a. to send signals from one part of the body to other parts of the body
b. to break down food into nutrients that can be circulated throughout the body
c. to exchange oxygen and carbon dioxide gases within the body
d. to protect the body against foreign substances, such as bacteria and viruses

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected.b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans.c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host.d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.