code: def min_height(root):
      if root is None:
          return 0
      height = 0
      level = [root]
      while level:
          height += 1
          new_level = []
          for node in level:
              if node.left is None and node.right is None:
                  return height
              if node.left is not None:
                  new_level.append(node.left)
              if node.right is not None:
                  new_level.append(node.right)
          level = new_level
      return height
  
label_desc: Use image node_id 2 for calling a global function with example usage: min_height(root) and returns: height, int, height