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) .
In-group. It is a social group toward which a member feels respect and loyalty. It is a group that an individual identifies in positive direction. If a person is part of the in-group then they are collectively part of an inner circle of friends.An inner circle may contain sub-groups within the inner circle including the apex (best friends), core (very close friends), outer rim, etc.his is usually a small group, of around 3 to 15 people, who work as a team to accomplish their goals. Dyad. This is a social group with two members. Social interaction in a dyad is typically more intense than in larger groups because neither member shares the other's attention with anyone else.