This is _____ of all trees.
This is _____ of all trees.
Explanation
"Shortest" is the superlative form of "short".
It indicating the least height.
It's used to compare with all other trees, implying this tree is the shortest among all.
"Shortest" is the superlative form of "short".
It indicating the least height.
It's used to compare with all other trees, implying this tree is the shortest among all.