Projections of future climate change vary widely. What is the primary source of uncertainty for how much earth’s climate will warm by the end of the century

Which of the following is an oxidation-reduction reaction? (pictured below)

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 group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae