Below are the choices, the answer is no. 3:
1) The virus was descended from a common ancestor of bird, pig, and human flu viruses.
2) The infected individuals happened to be infected with all three virus types.
3)Related viruses can undergo genetic recombination if the RNA genomes mix andmatch during viral assembly.
4)The human was likely infected with various bacterial strains that contained all three<span>RNA viruses.</span>
Explanation:
a thermocline is an abrupt temperature gradient in a body of water such as a lake, marked by a layer above and below which the water is at different temperatures.
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Fossils can show us how an species has adapted to changes in their environment over time because the fossils are in different layer of the earths crust, each slightly different from the one before.
