insects have been on earth for 400000000 years
earth's_year has not 365_days earth_year is 365_days_long. earth's_year has 365_days every_fourth_year_earth's_year has 366_days earth is not over_400_million_years_old. one_year has 365.25_days years has 366_days earth is over_400_million_years_old. earth is over_5_billion_years_old. earth is 4.5_billion_years_old.