Pls help asap...

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

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels

Which component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale