Death rates by age and race in City X, 2010 Death rate per 1,000
Age (years)
White
Black
<1
28.2
45.1
1-4
0.5
1.4
5-17
0.6
0.8
18-44
3.8
5.2
45-64
17.4
24.6
65+
71.1
71.2
Total (all ages)
17.4
14.2
What is the conclusion from the comparison of black and white age-specific rates with total black and white rates?
O A. The black population is generally older than the white population
OB. The two races have approximately the same age distribution
OC. The white population is generally older than the black population
OD. Blacks die at older ages than whites, so their overall mortality rates are lower
O E. Case fatality rates are higher in blacks than in whites

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.