(Children are the greatest agents of cultural change....(blah blah))
The pool of children can be thought of as the engine room of cultural evolution. Once adults leave the pool, they adhere to the values they learned in childhood.
Q.1. Is the meaning of 'pool' above same as 'group'? I've looked at the Oxford Dictionaries definition of pool ("A group of people available for work when required or considered as a resource"), but I still don't understand.
Q.2. The "they" in the second sentence refers to adults who leave the pool?
Q.3. I don't quite understand what the two sentences are saying. Can anyone explain, please?
Thank you in advance.