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Ck 12: Life Science: Active Transport
[Free Registration/Login may be required to access all resource tools.] During active transport, molecules move from an area of low concentration to an area of high concentration. This is the opposite of diffusion, and these molecules...
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Ck 12: Life Science: Cell Biology
[Free Registration/Login may be required to access all resource tools.] A cell is the smallest structural and functional unit of an organism. Learn more about cell biology in this learning module produced by CK-12.
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Ck 12: Life Science: Passive Transport
[Free Registration/Login may be required to access all resource tools.] The cell membrane is semi-permeable. Sometimes molecules need the help of special transport proteins or an input of energy to help them move across it. When an input...
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Ck 12: Earth Science: Non Renewable Energy Resources
[Free Registration/Login may be required to access all resource tools.] What nonrenewable energy resources and fossil fuels are and how they form, and the drawbacks of using nonrenewable energy resources.
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Ck 12: Physical Science: Why Earth Is a Magnet
[Free Registration/Login may be required to access all resource tools.] Why the Earth is a magnet and how its inner structure relates to its magnetic field.
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Ck 12: Physical Science: Static Electricity and Static Discharge
[Free Registration/Login may be required to access all resource tools.] What static electricity and static discharge are, and how lightning occurs.
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Ck 12: Physical Science: Mixtures
[Free Registration/Login may be required to access all resource tools.] Definition of mixture and examples, homogeneous and heterogeneous mixtures, types of mixtures and how to separate mixtures.
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Ck 12: Physical Science: Melting
[Free Registration/Login may be required to access all resource tools.] What happens to matter when it melts and the definition of melting point.
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Ck 12: Physical Science: Mechanical Wave
[Free Registration/Login may be required to access all resource tools.] What a mechanical wave is and what it travels through, and different types of mechanical waves.
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Ck 12: Physical Science: Friction
[Free Registration/Login may be required to access all resource tools.] Definition of friction, why it occurs, and the factors that affect it.
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Ck 12: Life Science: Reproduction in Seedless Plants
[Free Registration/Login may be required to access all resource tools.] Seedless plants can reproduce asexually or sexually. Some seedless plants, like hornworts and liverworts, can reproduce asexually through fragmentation. When a small...
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Ck 12: Life Science: Prokaryotic and Eukaryotic Cells
[Free Registration/Login may be required to access all resource tools.] There are two basic types of cells, prokaryotic cells and eukaryotic cells. The main difference between eukaryotic and prokaryotic cells is that eukaryotic cells...
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Ck 12: Life Science: Plant Reproduction and Life Cycle
[Free Registration/Login may be required to access all resource tools.] The life cycle of a plant is very different from the life cycle of an animal. Humans are made entirely of diploid cells (cells with two sets of chromosomes). Our...
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Ck 12: Life Science: Microscopes
[Free Registration/Login may be required to access all resource tools.] A microscope is a tool used to make things that are too small to be seen by the human eye look bigger. Before microscopes were invented in 1595, the smallest things...
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Ck 12: Life Science: Cell Division
[Free Registration/Login may be required to access all resource tools.] Cells do eventually wear out. At that point, they need to be replaced. This is one reason that your cells divide. New cells that result after cells divide are also...
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Ck 12: Chemistry: Scientific Process
[Free Registration/Login may be required to access all resource tools.] Role of investigations in science and the steps of the scientific method.
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Ck 12: Conservation of Mass and Energy in Nuclear Reactions
[Free Registration/Login may be required to access all resource tools.] Explores the conservation of mass and energy in nuclear reactions and Einstein's equation.
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Ck 12: Physical Science: Conservation of Mass in Chemical Reactions
[Free Registration/Login may be required to access all resource tools.] Explains Law of conservation of mass and why chemical equations must be balanced.
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Ck 12: Physical Science: Chemical Properties of Matter
[Free Registration/Login may be required to access all resource tools.] Definition of chemical property and examples of the chemical properties of matter.
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Ck 12: Physical Science: Calculating Acceleration From Force and Mass
[Free Registration/Login may be required to access all resource tools.] How to calculate acceleration from force and mass, and force from mass and acceleration.
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Ck 12: Earth Science: Renewable Versus Non Renewable Resources
[Free Registration/Login may be required to access all resource tools.] Distinguishes between renewable and nonrenewable resources.
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Ck 12: Physical Science: Women and People of Color in Science
[Free Registration/Login may be required to access all resource tools.] Biases against women and people of color in science, and contributions of women and people of color in science.
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Ck 12: Physical Science: Conservation of Energy in Chemical Reactions
[Free Registration/Login may be required to access all resource tools.] Covers the law of conservation of energy and how energy is conserved in chemical reactions.
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Ck 12: Earth Science: Supercontinent Cycle
[Free Registration/Login may be required to access all resource tools.] The history of plate tectonics past and future.
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