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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: Organelles
[Free Registration/Login may be required to access all resource tools.] All organelles are found in eukaryotic cells, while most are not found in prokaryotic cells. Learn more about organelles in this learning module produced by CK-12.
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Ck 12: Life Science: Seeds and Seed Dispersal
[Free Registration/Login may be required to access all resource tools.] Plants seem to grow wherever they can. How? Plants can't move on their own. So how does a plant start growing in a new area? Learn more about seeds and seed...
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Ck 12: Physical Science: Kinetic Energy
[Free Registration/Login may be required to access all resource tools.] Definition of kinetic energy and how to calculate it.
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Ck 12: Physical Science: Wave Amplitude
[Free Registration/Login may be required to access all resource tools.] What wave amplitude is and how to measure it, and what determines the amplitude of a wave.
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Ck 12: Life Science: Human Causes of Extinction
[Free Registration/Login may be required to access all resource tools.] In addition to habitat destruction, other human-caused problems are also threatening many species. These include issues associated with climate change, pollution,...
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Ck 12: Physical Science: Electronic Signal
[Free Registration/Login may be required to access all resource tools.] Covers electronic signal, how an electric current can be used to send an electronic message, what analog and digital signals are, and the difference between them.
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Ck 12: Physical Science: Newton's Third Law
[Free Registration/Login may be required to access all resource tools.] Newton's Third Law of Motion - action and reaction forces and why they are not balanced forces.
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Ck 12: Physical Science: States of Matter
[Free Registration/Login may be required to access all resource tools.] Definition of state of matter and the three common states of matter and their differences.
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Ck 12: Physical Science: Chemical Reaction Overview
[Free Registration/Login may be required to access all resource tools.] Provides an introduction to chemical reactions.
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Ck 12: Life Science: Cloning
[Free Registration/Login may be required to access all resource tools.] Cloning is the process of creating an exact replica of an organism. The clone's DNA is exactly the same as the parent's DNA. Bacteria and plants have long been able...
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Ck 12: Life Science: Predation
[Free Registration/Login may be required to access all resource tools.] Predation is another mechanism in which species interact with each other. Predation is when a predator organism feeds on another living organism or organisms, known...
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Ck 12: Life Science: Symbiosis
[Free Registration/Login may be required to access all resource tools.] Symbiosis describes a close and long-term relationship between different species. At least one species will benefit in a symbiotic relationship. There are three...
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Ck 12: Physical Science: Heat Conduction
[Free Registration/Login may be required to access all resource tools.] Investigates what conduction is, how it works, and gives examples of conduction.
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Ck 12: Life Science: Respiratory System Organs
[Free Registration/Login may be required to access all resource tools.] When you think of the processes of breathing, the lungs probably come to mind. The lungs are the main organ of the respiratory system. However, many other organs are...
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Ck 12: Life Science: Producers
[Free Registration/Login may be required to access all resource tools.] Energy is the ability to do work. In organisms, this can be physical work, like walking or jumping, or it can be the work used to carry out the chemical processes in...
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Ck 12: Life Science: Plant Cell Structures
[Free Registration/Login may be required to access all resource tools.] Even though plants and animals are both eukaryotes, plant cells differ in some ways from animal cells. Plant cells have a large central vacuole, are surrounded by a...
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Ck 12: Life Science: Photosynthesis
[Free Registration/Login may be required to access all resource tools.] Plants are producers, which means they are able to make their own food, as well as "food" for other organisms. Plants are also autotrophs - they collect energy from...
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Ck 12: Life Science: Natural Selection
[Free Registration/Login may be required to access all resource tools.] The theory of evolution by natural selection means that the inherited traits of a population change over time. Inherited traits are features that are passed from one...
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Ck 12: Life Science: Lymphatic System
[Free Registration/Login may be required to access all resource tools.] If pathogens get through the body's first two lines of defense, a third line of defense takes over. This third line of defense involves the immune system. The immune...
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Ck 12: Physical Science: Recognizing Chemical Reactions
[Free Registration/Login may be required to access all resource tools.] Signs that a chemical reaction has occurred.
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Ck 12: Physical Science: Conservation of Mass
[Free Registration/Login may be required to access all resource tools.] The law of conservation of mass and an example.
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Ck 12: Life Science: Population Growth Patterns
[Free Registration/Login may be required to access all resource tools.] What does population growth mean? You can probably guess that it means the number of individuals in a population is increasing. The population growth rate tells you...
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Ck 12: Life Science: Importance of Biodiversity
[Free Registration/Login may be required to access all resource tools.] Biodiversity is a measurement of the amount of variation of the species in a given area. More specifically, biodiversity can be defined as the variety of life and...
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