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) .
Under primary group we understand a small social group, members of which share personal and close relations with each other. Secondary group is usually a social group member of which do not have so close personal relations as in the primary one (Marshall, 1998).hey are limited by the goal of each secondary group. The meaning of relations inside primary and secondary groups is also different. In primary groups relations themselves make the main value for the members of the group. For example, family relations are valuable themselves, they do not serve for special goals.