Which of the following pregnant women is more likely to have twins or triplets? Christina is a nineteen-year-old unwed mother.

Martina is forty-one and taking fertility drugs.

Shannon is twenty-six and got pregnant despite taking birth control.

Rhiannon is thirty-two and has diabetes.
A: Shannon
B: Christina
C: Martina
D: Rhiannon

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.