Vulcan blood is presumed to be green in color , the explanation for this ( first definitely advanced in the installment  Obsession ,  from the original program ) being that the oxiferous ( oxygen-carrying ) protein hemoglobin , in Vulcan blood cells , is chemically based on the element copper , rather than the element iron as is the case with ...
SECONDARY GROUPS The term secondary group has come into use in sociology to describe any group which lacks one or more of the elements that go together to characterize a primary group. In general, a secondary group is composed of individuals who lacks strong emotional ties one another.. (end of quotation) .
Minority group is a term referring to a category of people differentiated from the social majority, i.e. those who hold the majority of positions of social power in a society, and may be defined by law. Rather than a relational  social group , as the term would indicate, minority group refers to the above-described.The differentiation can be based on one or more observable human characteristics, including, but not limited to: ethnicity, race, gender, wealth, health or sexual orientation.ociologist Louis Wirth defined a minority group as a group of people who, because of their physical or cultural characteristics, are singled out from the others in the society in which they live for differential and unequal treatment, and who therefore regard themselves as objects of collective discrimination..