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

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 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 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 learning activity you'll explore a step-by-step process to solve simple free-body diagrams. They identify forces acting in the x or y direction in interactive exercises.

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

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

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.

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