Which adjective indicates something that covers a span of 100 years?

Which adjective indicates something that covers a span of 100 years?OptionsQuadrennialMillennialCentennialDecennial

What adjective describes an event that happens every two years?OptionsTriennialSemiannual BimonthlyBiennial

What adjective describes an event that happens every two years?Options BimonthlyBiennialTriennialSemiannual

For the world as a whole, life expectancy has increased from forty-eight years in 1950 to __________ years today.A.fifty-oneB.seventy-oneC.eighty-oneD.sixty-oneSubmit

Please select the best response: “The average life span in the twentieth century”:Question 36Select one:a.did not change significantlyb.increased slightly.c.nearly doubled.d.nearly tripled.