Which of these is alive?

Which one of these is alive?

These are planks of wood. The planks have been made from a tree. What can we say about the planks?

The dog is a living thing. The dog is alive. But what is the dog doing?

This is a bonfire. What can we say about the bonfire?

This is an oak tree. In winter the oak tree has no leaves. What can we say about the oak tree?

These are logs. A tree has been cut down and sawn up. What can we say about the logs?

How do you know this tree is alive?

Ellie is using a computer. Is the computer alive? What can we say about the computer?

Cars move. This one can go very fast. They also make a lot of noise. But are they alive? What can we say about the car?