How do trees interact with other organisms? a. They provide other organisms with food.
b. They receive shelter from other organisms.
c. They obtain food from other organisms.
d. All of the above

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