How do we know what happened on earth before humans were around?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Which locations on the map are low-pressure areas? a b c d e