Use this lesson to see how animals can have very interesting relationships. Some help each other, some benefit from others, and some hurt others. Young scientists are sure to benefit from this eye-opening lesson.

What do a bicycle and a car have in common? They both move using the simple machine wheel and axle. In this lesson, students learn about how this simple machine works, and will identify objects that use a wheel and axle.

Without natural resources, our world would be a very different place. Help your class understand the importance of water, plants, and soil with this exploratory science lesson.