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

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

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

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

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

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

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

In this interactive object, learners review how to read a caliper. They then test their skills with eight practice questions.

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 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.

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

In this interactive object, learners read the definitions of the parts of a cell and assemble a basic eukaryotic cell in a drag and drop exercise. A matching quiz involving cell terms and their definitions completes the activity.