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) .
To understand the sociological perspective on race and ethnicity, it is important to understand the meanings of these concepts. An ethnic group is a social category of people who share a common culture, such as a common language, a common religion, or common norms, customs, practices, and history. minority group is any distinct group in society that shares common group characteristics and is forced to occupy low status in society because of prejudice and discrimination. A group may be classified as a minority on the basis of ethnicity, race, sexual preference, age, or class status.