What is the purpose of Long term memory (say 10 years or longer).

If something is important enough to remember, then it would be performed more often, therefore making a memory of a previous previous use of that performance unnecessary.

So what purpose, in the Evolutionary scheme of things does a Long term memory ability have.

Also: if other mammals have this same ability then it would seem that this ability must have developed before primates were separated from other mammals. (otherwise it would be too much of a conincidence for two different orders of life to have developed the same [un-needed]ability).

y