Learners calculate gas density from the standard molar volume and observe how the density increases with the increasing molecular weight of the gas.

In this module, you will explore the many kinds of cell models and learn about the ways they differ from animal models.

Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.

Equilibrium plays a vital role in our lives. We'll show you how the equilibrium formula works in real life using our friend the chicken.

In this learning activity you'll explore the difference between mass and weight.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

This learning object demonstrates the process by which antigens are identified, processed, and presented to mediators of the cellular immune system.

In this animated object, learners view hydrogen and hydroxide ions in a solution. A brief quiz on the basic principles of the term pH completes the activity.

The Animal Welfare Act, or AWA, gives protection to animals used in research, education, and entertainment. Explore ethical use and some of the current alternatives in this module.

Imagine you're a college student volunteering in a lab that includes animal research and you're trying to decide if this would be a good experience. Play through this module to understand the regulations for animal well-being and how they impact animal welfare. Prove you're an Animal Welfare Whiz!

In this animated and interactive object, learners examine the structure and functions of granulocytes and agranulocytes. Two exercises complete the activity.