Astudent is looking at a paramecium sp. using a compound light microscope. she turns the iris diaphragm to adjust

the brightness by controlling the amount of light beaming through the image

the objective lens and increase the magnification of the image

the electrons beamed through the image to regulate the brightness

the position of the paramecium sp. on the slide in order to center it for maximum magnification

answer; polycythemia is the correct answer;

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: