[Free Registration/Login may be required to access all resource tools.] Covers electromagnetic radiation and its properties, and the electromagnetic spectrum.

[Free Registration/Login may be required to access all resource tools.] How energy can be generated through nuclear reactions.

[Free Registration/Login may be required to access all resource tools.] Investigates fundamental particles and their discovery, and how they relate to fundamental forces.

[Free Registration/Login may be required to access all resource tools.] Saturation and the difference between saturated and unsaturated solutions.

[Free Registration/Login may be required to access all resource tools.] Isomers and their properties, how the number of carbon atoms determines how many isomers a hydrocarbon has.

[Free Registration/Login may be required to access all resource tools.] Electric power and electric energy use of appliances and how to calculate them.

[Free Registration/Login may be required to access all resource tools.] Ionic compounds: how they form, how the are named, and their properties and uses.

[Free Registration/Login may be required to access all resource tools.] What renewable energy resources are and examples of renewable energy resources.

[Free Registration/Login may be required to access all resource tools.] Compare and contrasts renewable and non-renewable resources.

[Free Registration/Login may be required to access all resource tools.] The reaction of acids and bases and what ions are produced and the salts that form.

[Free Registration/Login may be required to access all resource tools.] Amphibians are a group of vertebrates that have adapted to live in both water and on land. Amphibian larvae are born and live in water, and they breathe using gills....

[Free Registration/Login may be required to access all resource tools.] Barking, purring, and playing are just some of the ways in which dogs and cats behave. These are examples of animal behaviors. Animal behavior is any way that...

[Free Registration/Login may be required to access all resource tools.] For many years, archaea were classified as bacteria. Like the bacteria, archaea lacked a nucleus and membrane-bound organelles and, therefore, were prokaryotic...

[Free Registration/Login may be required to access all resource tools.] The immune system usually protects you from pathogens and other causes of disease. When the immune system is working properly, it keeps you from getting sick. But...

[Free Registration/Login may be required to access all resource tools.] Yogurt is a good source of calcium. Yogurt also contains active cultures of "good" bacteria. Foods that contain these beneficial bacteria are sometimes called...

[Free Registration/Login may be required to access all resource tools.] Bacteria, being single-celled prokaryotic organisms, do not have a male or female version. Bacteria reproduce asexually. In asexual reproduction, the "parent"...

[Free Registration/Login may be required to access all resource tools.] Some defenses, like your skin and mucous membranes, are not designed to ward off a specific pathogen. They are just general defenders against disease. Your body also...

[Free Registration/Login may be required to access all resource tools.] The majority of the corn in the United States is genetically engineered. Corn syrup is used to sweeten many things, like Coke. Corn is also fed to the cows. Learn...

[Free Registration/Login may be required to access all resource tools.] How do birds reproduce? We know that chickens lay eggs. But how do they do that? Learn more about bird reproduction in this learning module produced by CK-12.

[Free Registration/Login may be required to access all resource tools.] Cancer is a disease that causes cells to divide out of control. Normally, the body has systems that prevent cells from dividing out of control. But in the case of...

[Free Registration/Login may be required to access all resource tools.] Cartilaginous fish range in size from the dwarf lanternshark, at 6.3 inches, to the 50-foot whale shark. These fish have a jaw and evolved from the jawless fish....

[Free Registration/Login may be required to access all resource tools.] Although we generally discuss plants when learning about photosynthesis, keep in mind that plants are not the only organisms that can make their own food. Some...

[Free Registration/Login may be required to access all resource tools.] Sexual reproduction combines gametes from two parents. Gametes are produced by a special type of cell division known as meiosis. Meiosis contains two rounds of cell...

[Free Registration/Login may be required to access all resource tools.] Does evolution only happen gradually through small changes? Or is it possible that drastic environmental changes can cause new species to evolve? Or can both small...