Explains the processes by which a hamburger and other food are used to make energy, strong bones, and solid mucles as they pass through the digestive system
For hundreds of years people have wanted to fly
Describes the parts of the hand and all the things our hand help us to do
A brief study of the first creatures on earth to develop voices and an aversion to dry skin
Provides basic facts about the behavior of bats and describes how they benefit the environment