In this animated activity, learners explore three major methods of heat transfer and practice identifying each.

Students identify the parts of a triple beam balance and practice measuring the mass of objects.

In this animated and interactive object, learners examine ventilation, external and internal respiration, and gas transport.

In this learning activity you'll study the structure of the cell membrane and construct it using the correct molecules.

In this animated and interactive object, learners identify the valves and chambers of the heart.

In this animated activity, learners examine the two major phases of cell division: mitosis and cytokinesis.

In this animated object, learners view molecules as they collide and move between two different solutions. They also observe what happens when the temperature of the solutions is raised or lowered.

In this well-illustrated activity, learners examine the three types of intermolecular forces: dipole-dipole forces, London or Van der Waals forces, and the hydrogen bond. Two interactive questions are included.

In this learning activity you'll examine force, mass, and acceleration to understand this "Law of Acceleration."

In this animated and interactive object, learners examine ABO blood antigens and Rh antigens and their compatibility.

In this animated object, learners are introduced to the structure and function of animal cell organelles.

In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.