Chicken and egg problems

A chicken and egg problem
Is a problem that appears unsolvable
Because the logic is circular
Every chicken was an egg
Every egg was laid by a chicken
That's how reproduction works
The origin of replication and production
Of DNA and gene products
Such as RNA and protein
Can be viewed as such a problem too
Every new instance of
Replication and production in a cell
Is a product of past
Replications and productions
Many think RNAs came first
In that there are organisms
Where RNA can carry out
Functions of DNA and RNA
But perhaps it is not so simple
As in most organisms
The circularity is unbreakable
And we geneticists have to deal with it
Are there any other such examples
Of chicken and egg problems
That cross your mind?
Or perhaps problems that appear linear
But are actually circular?