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Ck 12: Life Science: Cancer
[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...
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Ck 12: Life Science: Cartilaginous Fish
[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....
CK-12 Foundation
Ck 12: Life Science: Light Reactions of Photosynthesis
[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...
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Ck 12: Life Science: Meiosis
[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...
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Ck 12: Life Science: Microevolution and Macroevolution
[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...
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Ck 12: Life Science: Mollusks
[Free Registration/Login may be required to access all resource tools.] Mollusks are invertebrates that usually have a hard shell, a mantle, and a radula. Learn more about mollusks in this learning module produced by CK-12.
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Ck 12: Life Science: Nonvascular Plants
[Free Registration/Login may be required to access all resource tools.] Nonvascular seedless plants lack vascular tissue and they do not have true roots, stems, or leaves, but they can have stem-like and root-like structures. These...
CK-12 Foundation
Ck 12: Life Science: Origin of Species
[Free Registration/Login may be required to access all resource tools.] The creation of a new species is called speciation. Most new species develop naturally. But humans have also artificially created new breeds and species for...
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Ck 12: Life Science: Outdoor Air Pollution
[Free Registration/Login may be required to access all resource tools.] Air pollution is due to chemical substances and particles released into the air mainly by human actions. This pollution affects entire ecosystems around the world....
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Ck 12: Life Science: Pathogens
[Free Registration/Login may be required to access all resource tools.] Has this ever happened to you? A student sitting next to you in class has a cold. The other student is coughing and sneezing, but you feel fine. Two days later, you...
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Ck 12: Life Science: Plant Like Protists
[Free Registration/Login may be required to access all resource tools.] Plant-like protists are known as algae. They are a large and diverse group. Plant-like protists are autotrophs. This means that they produce their own food. They...
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Ck 12: Life Science: Pregnancy and Childbirth
[Free Registration/Login may be required to access all resource tools.] While a woman is pregnant, the developing baby may be called an embryo or a fetus. The embryo stage lasts until the end of the 8th week after fertilization. After...
CK-12 Foundation
Ck 12: Life Science: Preventing Noninfectious Diseases
[Free Registration/Login may be required to access all resource tools.] Most allergies can be prevented by avoiding the substances that cause them. For example, you can avoid pollens by staying indoors as much as possible. You can learn...
CK-12 Foundation
Ck 12: Life Science: Primates
[Free Registration/Login may be required to access all resource tools.] If primates are mammals, what makes them seem so different from most mammals? Primates, including humans, have several unique features. Some adaptations give...
CK-12 Foundation
Ck 12: Life Science: Protist Characteristics
[Free Registration/Login may be required to access all resource tools.] Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most protists are single-celled. Other than these features, they...
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Ck 12: Life Science: Protists Nutrition
[Free Registration/Login may be required to access all resource tools.] The cells of protists need to perform all of the functions that other cells do, such as grow and reproduce, maintain homeostasis, and obtain energy. They also need...
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Ck 12: Life Science: Reptiles
[Free Registration/Login may be required to access all resource tools.] What reptiles can you name? Snakes, alligators, and crocodiles are all reptiles. Modern reptiles live on every continent except Antarctica. They range in size from...
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Ck 12: Life Science: Seasonal Changes in Plants
[Free Registration/Login may be required to access all resource tools.] Have you seen the leaves of plants change colors? During what time of year does this happen? What causes it to happen? Plants can sense changes in the seasons....
CK-12 Foundation
Ck 12: Life Science: Social Behavior of Animals
[Free Registration/Login may be required to access all resource tools.] Why is animal communication important? Without it, animals would not be able to live together in groups. Animals that live in groups with other members of their...
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Ck 12: Life Science: Symbiotic Relationships of Fungi
[Free Registration/Login may be required to access all resource tools.] Fungi don't live in isolation. They often interact with other species. In fact, fungi can be dependent on another organism for survival. When two species live close...
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Ck 12: Life Science: Types of Nutrients
[Free Registration/Login may be required to access all resource tools.] Carbohydrates, proteins, and lipids contain energy. When your body digests food, it breaks down the molecules of these nutrients. This releases the energy so your...
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Ck 12: Life Science: Vascular Seedless Plants
[Free Registration/Login may be required to access all resource tools.] Vascular seedless plants have vascular tissue but do not have seeds. Most of the large vascular seedless plants from ancient times are now extinct, but their smaller...
CK-12 Foundation
Ck 12: Life Science: Viruses
[Free Registration/Login may be required to access all resource tools.] We have all heard of viruses. The flu, the common cold, and many other diseases are caused by viruses. But what is a virus? Do you think viruses are living? Which...
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Ck 12: Life Science: Water Cycle
[Free Registration/Login may be required to access all resource tools.] Water and elements like carbon and nitrogen are constantly being recycled through the environment. This process is called a biogeochemical cycle because it involves...
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