Learners read a brief description of the vertebral column and examine the distinctive features of the cervical, thoracic, and lumbar vertebrae.

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 interactive object, learners use the Law of Cosines to calculate forces.

Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

Students practice identifying common elements from the periodic table by name or symbol.

In this learning activity you'll explore the food pyramid and the recommended services.

Learners examine the lifecycle of basidiomycetes. Terminology and fungi examples are provided.

Explore how a goldfinch interacts with its environment and how it's affected by environmental changes.

Music Credit:

Title: Good Starts

Artist: Jingle Punks

Genre: Cinematic

Mood: Happy

Download: https://www.youtube.com/audiolibrary/...

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

In this animated activity, learners examine the terms "half-reaction," "oxidizing agent," and "reducing agent" and follow five interactive examples to balance equations for oxidation-reduction reactions. Three problems are provided as a self-check.

In this interactive lesson, students examine the quantitative relationship between chemicals in a balanced mathematical equation.

In this learning activity you'll analyze the basic steps in conjugation and applies the effect to microbial characteristics.

In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

In this animated object, learners view the "T" and "P" waves and the "QRS complex." A brief quiz completes the activity.

In this interactive object, learners examine the neuron pathway into and out of the spinal cord. They complete the activity by testing their knowledge of vocabulary and the location of spinal cord structures.

In this animated activity, learners compare the van der Waals equation with the Ideal Gas Law.

Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.

Learners match the names of parasitic organisms to the diseases they cause and the modes of transmission.

Learners test their knowledge of fungal diseases by completing six exercises.

In this animated object, students examine the role that the solubility of water plays in various biological functions.

Learners complete two exercises. In the first quiz, they divide viruses into two categories: RNA and DNA. They later match each virus with the disease it causes.

In this colorful, interactive object, learners examine how materials on the nanoscale compare with those on the macroscale. The focus is on the difference between macroscale and nanoscale gold in both color and melting point.

Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.

Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

Learners examine how the boiling point increases with increasing pressure. An example from industry is given.