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) .
Although sociological literature reveals scattered references towomen as a minority group, comparable in certain resepcts to racial,ethnic, and national minorities, no systematic investigation has beenundertaken as to what extent the term minority group is applicableto women.or the two types presented above: (1) those who do not know thatthey are being discriminated against on a group basis; and (2) thosewho acknowledge the propriety of differential treatment on a groupbasis, the subjective attributes of a minority group member arelacking.