If the ladder is not stable, it is better to have someone hold the ladder in the bottom ( only someone who is strong and confident)
Answer:
a submenu
Explanation:
a menu inside a menu is called a submenu or recursive menu
The hot perimeter or isolation zone would be the area wherein the blast coming from an explosive device originates. In addition, as the distance from the origin of the blast increases, in which these would now be the warm and cold zones, the damage of its surroundings decreases as well.