Answer
The proximate cause is the immediate sharing of resources, which can enhance the older offspring’s survival. The ultimate cause is the overall survival of the group and protection of their genetic lineage.
Work Step by Step
By participating in a cooperative group, the adult offspring gain access to mutual protection and resources that can benefit them in the moment. In the long term, both this and the increased survival odds of their siblings help ensure that their genes will be passed on to future generations.
