Boys and girls everywhere wonder about the things they see around them. And they wonder about themselves, too. They wonder how their bodies work. They wonder about their secret selves---their...
Plants and animals need each other
Plants and animals trade with each other. They trade for things they both need to stay alive. Animals breathe air. The air gets changed inside their bodies. When they breathe the air out again...
Hiding from winter
Amphibians are cold-blooded. Their bodies are just about as warm or as cold as the air or water around them. So when winter comes, and the days get colder, an amphibian's body gets colder, too. The...