Which of the following substitutions can reduce air pollution? using a bike instead of a car using dumps instead of landfills using coal instead of oil using fireplaces instead of a wind farms

Astudy shows that an influenza vaccine is 71.4% effective in preventing a particular type of influenza. if 15,422 people receive the vaccine, how many would not be protected and would be likely to get infulenza?

Some plants have reproductive structures that them reproduce using natural forces or animals. how does the reproductive structure shown here ensure the reproductive success of plants?

American college students invented football by combining what two sports?