humans have been on earth for 300000 years
earth is over_400_million_years_old. earth has several_billion_human_beings no_human has lived_longer_than_150_years world is where_many_humans_live. earth is over_5_billion_years_old. world has humans_in earth is 4.5_billion_years_old. earth's_year has 365_days world has more_than_six_billion_humans years has 366_days