Answer: False. Groups do not have a common identity but they do have shared expectations.
Explanation: Groups have one identity, because they are working together in a group. If they were working individually, they would have a common identity. Shared expectations are something that a group has because they all expect the people in the group to give it their all and accomplish their goals.
Nobody really knows who invented the iron foot Stirrup.
In 1733 John Kay with a "Flying Shuttle" or in 1765 James Hargreavers with the "Spinning Jenny"