Astrologer: Although some scientists have claimed that there is no correlation between people' s astrological signs and their personality types, this claim is scientifically unjustified
Since science does not have precise criteria for distinguishing one personality type from another, scientific studies cannot be used to disprove a correlation between personality type and any other phenomenon
It is a claim offered as support for a conclusion that is in turn offered as support for the overall conclusion drawn in the argument.