By what mechanism does refrigeration at 4°c slow food spoilage by contaminating microbes?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.

Name the organism that belongs to the kingdom protista.