A car takes fuel, burns it to produce energy, moves and excretes smoke. Why can we not call the car a living thing?

Science Quiz/Puzzle: 

Across
2. Waste expelled by kidneys as urine.
4. Organisms that feed on plants or other organisms.
6. Movement from one place to another shown by animals.
7. The basic unit of structure and function of organisms.

Down
1. They make their own food.
3. Reaction of organisms to some external change.
5. A change that evokes a response in organisms.