The Leaf

I saw a tree whose leaves have all fallen
It seemed like age has taken its toll
Or is it just the season?

I came to wonder
What force is responsible?
Is it the wind, whose blowing might have caused it to be detached from the branches?
Is it the tree, which might not have held the leaves tightly and just let it go?
Is it the leaf itself, which has not clung onto the branches enough to withstand the wind?
Is it just the changing of the season, which spelled its destiny?