The air makers

Most scientists think that the first tiny sea plants made it possible for life to come onto the land. To live, plants and animals must take in a gas called oxygen. The tiny sea plants and animals of...

The first plants

> Long ago, the land was empty. All the plants and animals lived in the > water. > > They looked like tiny blobs of jelly. Many hundreds of millions of years ago, the world was a scary place!...

Famous Gardens

Many people have small gardens in their yards, on a porch or patio, or even in a sunny window. But people have also made big gar­dens. Some are parks that go on for miles. Some are indoors, in...