"Is it alive?" asks Suzy. "Let's find out!"

The hen eats seeds and drinks water. She is alive!

The rock just sits there. It does not eat or grow. Not alive!

The little gum tree drinks the rain and grows. It is alive!

The tractor goes brrrm, but it does not eat or grow. Not alive!

"Am I alive?" asks Little Thunder.

"Yes!" laughs Spike. "You eat, drink and breathe. And you grow so big!"