How can we tell if something is alive?

Look out of the window. You can see a mango tree, a crow and a cow. You can also see a rock and a bicycle. Some of these things are alive. Some are not.
Animals are living things. Plants are living things too. People are living things. You are alive!
Living things need food and water. They grow bigger. They breathe. They have young, like a hen has chicks.
A rock is non-living. It has never been alive. The Sun is very hot, but it is not alive. A toy car can move, but it does not eat or grow. It is not alive.