Some scientists believe that small humanoid skeletons found on an Indonesian island are the remains of human beings with a growth disorder. It is more likely that they represent a distinct human species that became smaller over time due to environmental pressure. These skeletons do not fit the pattern of known growth disorders. And evidence suggests that certain fox and mouse species on the island have evolved into smaller versions of their common counterparts. Which one of the following most accurately expresses the conclusion drawn in the argument? ['Certain fox and mouse species on an Indonesian island have evolved into smaller versions of their common counterparts.', 'Environmental pressure can cause species living on islands to become smaller over time.', 'The humanoid skeletons do not fit the pattern of known growth disorders.', 'It is more likely that the humanoid skeletons represent a distinct human species than that they are the remains of human beings with a growth disorder.']