The table below shows the number of amino acid differences seen in several species compared to humans. Using the data in the table as an indicator of relatedness between species, indicate the species the most closely related to humans.

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