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) .
Member of one primary group may be involved in many activities. The situation is different for the secondary groups. In secondary groups activities are usually narrow. They 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.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.