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Ck 12: Life Science: Bacteria Reproduction
[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"...
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Ck 12: Life Science: B and T Cell Response
[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...
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Ck 12: Life Science: Biotechnology in Agriculture
[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...
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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....
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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...
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Ck 12: Life Science: Organization of the Human Body
[Free Registration/Login may be required to access all resource tools.] Cells, like these nerve cells, do not work in isolation. To send orders from your brain to your legs, for example, signals pass through many nerve cells. These cells...
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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: 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...
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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...
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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...
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