There are certain things we all need, in order to live. In order of priority, they are oxygen, water, food, sleep, and heat. Some people will argue as to whether there is anything else to add to the list. However, these are the things without which the human body cannot function. Without other things, life may be difficult but can be survived.
On the other hand, nobody wants just to survive, and so there is another level of priority below this. Without the above, we cannot live. Without the things on this lower level, we cannot live comfortably. It features things such as a roof over our heads, healthcare, and security.