CK-12 Foundation
Ck 12: Life Science: Adulthood and Aging
[Free Registration/Login may be required to access all resource tools.] When is a person considered an adult? That depends. Most teens become physically mature by the age of 16 or so. But they are not adults in a legal sense until they...
CK-12 Foundation
Ck 12: Life Science: Arachnids
[Free Registration/Login may be required to access all resource tools.] Arachnids are a class of joint-legged invertebrates in the subphylum Chelicerata. They live mainly on land but are also found in freshwater and in all marine...
CK-12 Foundation
Ck 12: Life Science: Bony Fish
[Free Registration/Login may be required to access all resource tools.] There are almost 27,000 species of bony fish, which are divided into two classes: ray-finned fish and lobe-finned fish. Most bony fish are ray-finned. These thin...
CK-12 Foundation
Ck 12: Life Science: Chordates
[Free Registration/Login may be required to access all resource tools.] Did you know that fish, amphibians, reptiles, birds, and mammals are all related? They are all chordates. Chordates are a group of animals that includes vertebrates,...
CK-12 Foundation
Ck 12: Life Science: Diffusion
[Free Registration/Login may be required to access all resource tools.] The process of molecules moving from an area where there are lots of molecules to an area where there are fewer molecules is known as diffusion. The diffusion of...
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Ck 12: Life Science: Flatworms
[Free Registration/Login may be required to access all resource tools.] The word "worm" is not very scientific. But it is a word that informally describes animals (usually invertebrates) that have long bodies with no arms or legs. Worms...
CK-12 Foundation
Ck 12: Life Science: Human Egg Cells
[Free Registration/Login may be required to access all resource tools.] When a baby girl is born, her ovaries contain all of the eggs they will ever produce. But these eggs are not fully developed. They develop only after she starts...
CK-12 Foundation
Ck 12: Life Science: Processes of Breathing
[Free Registration/Login may be required to access all resource tools.] Breathing is only part of the process of bringing oxygen to where it is needed in the body. After oxygen enters the lungs, what happens? Learn more about processes...
CK-12 Foundation
Ck 12: Physical Science: Density
[Free Registration/Login may be required to access all resource tools.] Definition of density and how to calculate density.
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Ck 12: Physical Science: Direction
[Free Registration/Login may be required to access all resource tools.] Explores direction and why it is important, direction as a component of motion, and how to represent direction and distance with vectors.
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Ck 12: Physical Science: Generators and Motors
[Free Registration/Login may be required to access all resource tools.] Expalins how an electric generator works.
CK-12 Foundation
Ck 12: Physical Science: Isotopes
[Free Registration/Login may be required to access all resource tools.] Definition of isotopes, how they are named and their stability.
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Ck 12: Physical Science: Neutrons
[Free Registration/Login may be required to access all resource tools.] Neutrons and how they cause different isotopes of an element, and the particles in neutrons.
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Ck 12: Life Science: Alligators and Crocodiles
[Free Registration/Login may be required to access all resource tools.] Crocodilia, containing both alligators and crocodiles, is an order of large reptiles. Reptiles belonging to Crocodilia are the closest living relatives of birds....
CK-12 Foundation
Ck 12: Life Science: Angiosperms
[Free Registration/Login may be required to access all resource tools.] Angiosperms, in the phylum Anthophyta, are the most successful phylum of plants. Angiosperms evolved the structure of the flower, so they are also called the...
CK-12 Foundation
Ck 12: Life Science: Arthropods
[Free Registration/Login may be required to access all resource tools.] How often do you think you see an arthropod? With over a million described species in the phylum containing arthropods, chances are you encounter one of these...
CK-12 Foundation
Ck 12: Life Science: Blood Types
[Free Registration/Login may be required to access all resource tools.] Do you know what your blood type is? Maybe you have heard people say that they have Type A or Type O blood. Blood type is a way to describe the type of antigens, or...
CK-12 Foundation
Ck 12: Life Science: Cnidarians
[Free Registration/Login may be required to access all resource tools.] Cnidarians, in the phylum Cnidaria, include organisms such as the jellyfish and sea anemones. These animals are found in shallow ocean water. Learn more about...
CK-12 Foundation
Ck 12: Life Science: Features of Populations
[Free Registration/Login may be required to access all resource tools.] A population is a group of organisms of the same species, all living in the same area and interacting with each other. Since they live together in one area, members...
CK-12 Foundation
Ck 12: Life Science: Origins of Life
[Free Registration/Login may be required to access all resource tools.] There is good evidence that life has probably existed on Earth for most of Earth's history. Fossils of blue-green algae found in Australia are the oldest fossils of...
CK-12 Foundation
Ck 12: Life Science: Roundworms
[Free Registration/Login may be required to access all resource tools.] The word "worm" is not very scientific. This informal term describes animals that have long bodies with no arms or legs. Worms with round, non-segmented bodies are...
CK-12 Foundation
Ck 12: Physical Science: Catalysts
[Free Registration/Login may be required to access all resource tools.] How catalysts work and their role in living things.
CK-12 Foundation
Ck 12: Physical Science: Compounds
[Free Registration/Login may be required to access all resource tools.] Investigates compounds and their properties, the elements that form them, and their structure.
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Ck 12: Physical Science: Freezing
[Free Registration/Login may be required to access all resource tools.] Explains what happens to matter when it freezes and the definition of freezing point.
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