Trees make all the starch in the world. Starch is the most important part of our food. Without trees we will not have any starch to eat.

Trees help us to get rain. The leaves of trees breathe out a lot of water vapour into he air. This makes the air cool. The cool air helps rainfall. Rain gives us water. No one can live without water. And we need trees to get water.

Trees have many more uses. The rubber tree grows in many parts of the world. From the sap of this tree we get rubber. Rubber is a very useful thing. Some trees like eucalyptus give us medicines. In South America there is a tree called the cow tree.People drink the sap of this tree instead of milk. It is less expensive than milk.

How long can a big tree live? Nobody knows. Some trees have already lived for more than four thousand years. They can live for five to six thousand years more. Some of them will live as long as ten thousand years. There is a tree called General Sherman in California in America. It is a huge evergreen tree. It is said to be several thousand years old.

How do we know the age of a tree? Do trees have birthdays? Yes, they do. They even get