Hi there, the answer is 625 sets of twins, as 1250 “twins” occur to a singular person, so “pairs” would be 1250/2 which equals 625.
The physical characteristics of influenza viruses are that they are single-stranded, RNA viruses enclosed in a helical nucleocapsid. On the outside, these viruses are enveloped. Two important proteins are found on surface of this envelope: hemagglutinin and neurominidase.
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