"IT’S GREEN! IT’S ALIVE! A forest is full of trees – and much, much more. Forests also have bushes and wildflowers. Vines climb up some trees. Moss grows on logs on the forest floor and on trees. Animals live in forests. So do people. Life on Earth would not exist without forests. Trees give off oxygen that we breathe. What’s inside: What's in a Forest, How a Forest Changes with the Seasons, Tropical Forests, How Forests Grow Back After a Fire, Chilly Land of Evergreens, Life on the Forest Floor, Friend of the Forests: Theodore Roosevelt. (24 KIDS DISCOVER magazines) .