1) A ___ is a non-living infectious particle. The different varieties of flu viruses
are called __.
The Spanish flu outbreak occurred in ___. The
determines which strains of influenza virus will most
likely be those that are the most active during the flu season. An_
is a part
of the viral, coating that the immune system recognizes.
flu shots contain
antigens from three strains of flu virus.

The rich natural resources made the sacramento valley a "garden of eden." permanent villages were established about 8,000 years ago.which choice combines these two sentences from paragraph two to achieve a coherent flow of ideas? a) the rich natural resources made the sacramento valley a "garden of eden" and permanent villages were established about 8,000 years ago. b) permanent villages were established about 8,000 years ago and the rich natural resources made the sacramento valley a "garden of eden." c) the rich natural resources made the sacramento valley a "garden of eden; " and so the permanent villages were established about 8,000 years ago. d) because of the rich natural resources which made the sacramento valley a ‘garden of eden,’ native americans established permanent villages there 8,000 years ago.