In this animated and interactive object, learners examine how blood flows through the heart and lungs. A brief quiz completes the activity.

In this screencast, learners examine hearing and balance. Detailed drawings of the outer, middle, and inner ear structures are included.

In this learning activity you'll review how every protein molecule of an organism is synthesized by that organism in a prescribed process. This activity helps students understand the fundamental life process of making protein.

In this learning activity you'll make observations and formulate an evaluation including diagnosis and microorganism identification.